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SEA - ONT

C$ 108 Find cheap flights from Seattle to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Ontario departing on 18/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Sat 15/6
Sat 22/6

Search hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Ontario, as well as popular online travel agencies
In the last 7 days, travellers have searched 42,211,976 times on KAYAK, and here is why:

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Cheap flight deals from Seattle to Ontario (SEA-ONT)

 
These are the cheapest deals for flights from Seattle to Ontario currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Seattle to Ontario

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Seattle to Ontario.

Recent one-way flight deals from Seattle to Ontario

Only flying one-way? Below are some of the best one-way flight deals from Seattle to Ontario found on KAYAK recently.

Recent last-minute flight deals from Seattle to Ontario

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from Seattle to Ontario.

Recent direct flight deals from Seattle to Ontario

The latest deals for direct flights from Seattle to Ontario so you can sit back and relax without the need for a layover.

Cheap bus & train deals from Seattle to Ontario

Find recent round-trip train or bus tickets from Seattle to Ontario.

All round-trip flight deals to Ontario

The cheapest plane tickets to Ontario found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
1:47 p.m. - 4:31 p.m.SEA-ONT
2h 44mdirect
9:54 a.m. - 12:47 p.m.ONT-SEA
2h 53mdirect
C$ 116Frontier
Find Deal
Tue, 18 Jun - Tue, 25 Jun
1:57 p.m. - 4:41 p.m.SEA-ONT
2h 44mdirect
10:04 a.m. - 12:57 p.m.ONT-SEA
2h 53mdirect
C$ 173Frontier
Find Deal
Wed, 12 Jun - Wed, 19 Jun
8:12 p.m. - 7:02 a.m.SEA-ONT
10h 50m1 stop
9:54 a.m. - 12:47 p.m.ONT-SEA
2h 53mdirect
C$ 176Frontier
Find Deal
Tue, 11 Jun - Tue, 18 Jun
3:49 p.m. - 6:33 p.m.SEA-ONT
2h 44mdirect
11:43 a.m. - 2:36 p.m.ONT-SEA
2h 53mdirect
C$ 177Frontier
Find Deal
Thu, 20 Jun - Sat, 22 Jun
7:55 a.m. - 10:38 a.m.SEA-ONT
2h 43mdirect
5:40 p.m. - 8:24 p.m.ONT-SEA
2h 44mdirect
C$ 214Delta
Find Deal
Tue, 6 Aug - Wed, 21 Aug
8:15 a.m. - 11:00 a.m.SEA-ONT
2h 45mdirect
5:00 p.m. - 11:59 p.m.ONT-SEA
6h 59m1 stop
C$ 226Delta
Find Deal
Wed, 19 Jun - Tue, 25 Jun
6:30 a.m. - 9:05 a.m.SEA-ONT
2h 35mdirect
8:20 p.m. - 10:55 p.m.ONT-SEA
2h 35mdirect
C$ 255Alaska Airlines
Find Deal
Tue, 2 Jul - Tue, 2 Jul
9:26 p.m. - 11:59 p.m.SEA-ONT
2h 33mdirect
7:00 a.m. - 11:37 a.m.ONT-SEA
4h 37m1 stop
C$ 281Alaska Airlines
Find Deal
Thu, 1 Aug - Fri, 23 Aug
6:30 a.m. - 12:45 p.m.SEA-ONT
6h 15m1 stop
1:55 p.m. - 6:46 p.m.ONT-SEA
4h 51m1 stop
C$ 384United Airlines
Find Deal
Tue, 18 Jun - Tue, 25 Jun
7:16 a.m. - 12:15 p.m.SEA-ONT
4h 59m1 stop
6:35 p.m. - 12:52 a.m.ONT-SEA
6h 17m1 stop
C$ 410United Airlines
Find Deal
Wed, 10 Jul - Sat, 13 Jul
8:15 a.m. - 11:00 a.m.SEA-ONT
2h 45mdirect
C$ 108Delta
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Tue, 18 Jun
7:15 p.m. - 11:44 p.m.SEA-ONT
4h 29m1 stop
C$ 120Delta
Find Deal
Tue, 13 Aug
8:15 a.m. - 11:00 a.m.SEA-ONT
2h 45mdirect
C$ 135Delta
Find Deal
Sun, 16 Jun
9:35 a.m. - 4:17 p.m.SEA-ONT
6h 42m1 stop
C$ 147Delta
Find Deal
Wed, 10 Jul
9:26 p.m. - 11:59 p.m.SEA-ONT
2h 33mdirect
C$ 155Alaska Airlines
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Tue, 16 Jul
4:40 p.m. - 10:52 p.m.SEA-ONT
6h 12m1 stop
C$ 195Alaska Airlines
Find Deal
Wed, 23 Oct
1:57 p.m. - 4:41 p.m.SEA-ONT
2h 44mdirect
C$ 202Frontier
Find Deal
Mon, 27 May
1:57 p.m. - 4:41 p.m.SEA-ONT
2h 44mdirect
C$ 203Frontier
Find Deal
Mon, 27 May
5:05 a.m. - 10:27 p.m.SEA-ONT
17h 22m2 stops
C$ 331United Airlines
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Wed, 5 Jun
4:25 p.m. - 10:27 p.m.SEA-ONT
30h 02m3 stops
C$ 481United Airlines
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Wed, 5 Jun
2:17 p.m. - 5:01 p.m.SEA-ONT
2h 44mdirect
10:14 a.m. - 1:07 p.m.ONT-SEA
2h 53mdirect
C$ 377Frontier
Find Deal
Fri, 17 May - Mon, 20 May
2:17 p.m. - 5:01 p.m.SEA-ONT
2h 44mdirect
11:04 p.m. - 9:55 a.m.ONT-SEA
10h 51m1 stop
C$ 433Frontier
Find Deal
Fri, 17 May - Mon, 20 May
2:17 p.m. - 5:01 p.m.SEA-ONT
2h 44mdirect
12:59 a.m. - 8:40 a.m.ONT-SEA
7h 41m1 stop
C$ 474Frontier
Find Deal
Fri, 17 May - Sun, 19 May
10:24 p.m. - 7:34 a.m.SEA-ONT
9h 10m1 stop
11:04 p.m. - 9:55 a.m.ONT-SEA
10h 51m1 stop
C$ 559Frontier
Find Deal
Fri, 17 May - Mon, 20 May
10:24 p.m. - 7:34 a.m.SEA-ONT
9h 10m1 stop
12:59 a.m. - 8:40 a.m.ONT-SEA
7h 41m1 stop
C$ 599Frontier
Find Deal
Fri, 17 May - Sun, 19 May
12:56 p.m. - 3:26 p.m.SEA-ONT
2h 30mdirect
8:09 p.m. - 10:50 p.m.ONT-SEA
2h 41mdirect
C$ 623Alaska Airlines
Find Deal
Fri, 17 May - Thu, 23 May
4:25 p.m. - 9:55 p.m.SEA-ONT
5h 30m1 stop
8:09 p.m. - 10:50 p.m.ONT-SEA
2h 41mdirect
C$ 635Alaska Airlines
Find Deal
Fri, 17 May - Thu, 23 May
10:54 a.m. - 1:33 p.m.SEA-ONT
2h 39mdirect
6:50 a.m. - 9:50 a.m.ONT-SEA
3h 00mdirect
C$ 670Delta
Find Deal
Tue, 21 May - Wed, 22 May
5:30 a.m. - 12:13 p.m.SEA-ONT
6h 43m1 stop
6:50 a.m. - 9:50 a.m.ONT-SEA
3h 00mdirect
C$ 751Delta
Find Deal
Tue, 21 May - Thu, 23 May
12:50 p.m. - 8:53 p.m.SEA-ONT
8h 03m1 stop
6:00 a.m. - 1:21 p.m.ONT-SEA
31h 21m2 stops
C$ 969United Airlines
Find Deal
Fri, 17 May - Mon, 20 May
1:47 p.m. - 4:31 p.m.SEA-ONT
2h 44mdirect
9:54 a.m. - 12:47 p.m.ONT-SEA
2h 53mdirect
C$ 80Frontier
Find Deal
Tue, 11 Jun - Tue, 18 Jun
1:47 p.m. - 4:31 p.m.SEA-ONT
2h 44mdirect
9:54 a.m. - 12:47 p.m.ONT-SEA
2h 53mdirect
C$ 116Frontier
Find Deal
Tue, 18 Jun - Tue, 25 Jun
1:57 p.m. - 4:41 p.m.SEA-ONT
2h 44mdirect
10:04 a.m. - 12:57 p.m.ONT-SEA
2h 53mdirect
C$ 173Frontier
Find Deal
Wed, 12 Jun - Wed, 19 Jun
7:55 a.m. - 10:38 a.m.SEA-ONT
2h 43mdirect
5:40 p.m. - 8:24 p.m.ONT-SEA
2h 44mdirect
C$ 214Delta
Find Deal
Tue, 6 Aug - Wed, 21 Aug
8:15 a.m. - 11:00 a.m.SEA-ONT
2h 45mdirect
6:30 p.m. - 9:14 p.m.ONT-SEA
2h 44mdirect
C$ 241Delta
Find Deal
Tue, 25 Jun - Sun, 30 Jun
6:30 a.m. - 9:05 a.m.SEA-ONT
2h 35mdirect
8:20 p.m. - 10:55 p.m.ONT-SEA
2h 35mdirect
C$ 255Alaska Airlines
Find Deal
Tue, 2 Jul - Tue, 2 Jul
8:15 a.m. - 11:03 a.m.SEA-ONT
2h 48mdirect
6:59 p.m. - 9:48 p.m.ONT-SEA
2h 49mdirect
C$ 268Delta
Find Deal
Sat, 6 Jul - Thu, 11 Jul
9:26 p.m. - 11:58 p.m.SEA-ONT
2h 32mdirect
8:09 p.m. - 10:50 p.m.ONT-SEA
2h 41mdirect
C$ 309Alaska Airlines
Find Deal
Tue, 4 Jun - Sat, 8 Jun
9:26 p.m. - 11:59 p.m.SEA-ONT
2h 33mdirect
8:20 p.m. - 10:55 p.m.ONT-SEA
2h 35mdirect
C$ 323Alaska Airlines
Find Deal
Sun, 23 Jun - Sat, 29 Jun
12:54 p.m. - 3:29 p.m.SEA-ONT
2h 35mdirect
8:20 p.m. - 10:55 p.m.ONT-SEA
2h 35mdirect
C$ 364Alaska Airlines
Find Deal
Thu, 13 Jun - Thu, 20 Jun

Flights from Seattle to Ontario - Travel Insights & Trends

Get data-powered insights and trends into flights from Seattle to Ontario to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Seattle to Ontario?

The average price of all flights from Seattle to Ontario clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from Seattle to Ontario, look for departures on Mondays and avoid leaving on a Thursday, as it's usually the priciest day. When flying back from Ontario, Tuesday is the cheapest day to fly and Monday is the most expensive.

What is the cheapest month to fly from Seattle to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Seattle to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Seattle to Ontario is September, where tickets cost C$ 229 on average. On the other hand, the most expensive months are December and April, where the average cost of tickets is C$ 372 and C$ 354 respectively.

How far in advance should I book a flight from Seattle to Ontario?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Seattle to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Seattle to Ontario, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 52 days before departure.

Which airlines provide the cheapest flights from Seattle to Ontario?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 3 days, Delta offered the best one-way deal for that route, at C$ 108. KAYAK users also found Seattle to Ontario round-trip flights on Frontier from C$ 116 and on Delta from C$ 214.

Which airlines fly most frequently between Seattle and Ontario?

The airlines most regularly connecting Seattle to Ontario are Delta (7 flights per day), Alaska Airlines (4 flights per day), and Frontier (2 flights per day).

Which airlines fly direct between Seattle and Ontario?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from Seattle to Ontario.
There are 3 airlines that fly direct from Seattle to Ontario. They are: Alaska Airlines, Delta and Frontier. The cheapest price of all airlines flying this route was found with Frontier at C$ 66. On average, the best prices for this route can be found at Frontier.

How many flights are there between Seattle and Ontario per day?

Each day, there are between 13 and 15 nonstop flights that take off from Seattle and land in Ontario, with an average flight time of 2h 39m. The most common departure time is 1:00 p.m. and most flights take off in the afternoon. Each week, there are 96 flights. The most frequent day of departure is Sunday, when 16% of all weekly flights depart. The fewest flights depart on a Tuesday.

Which cabin class options are there for flights between Seattle and Ontario?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There is only one cabin class option available for the route, which is Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How long does a flight from Seattle to Ontario take?

Direct flights cover the 2,477 km separating Seattle to Ontario in about 2h 30m.

What’s the earliest departure time from Seattle to Ontario?

Early birds can take the earliest flight from Seattle at 6:30 am and will be landing in Ontario at 9:05 am.

What’s the latest departure time from Seattle to Ontario?

If you prefer to fly at night, the latest flight from Seattle to Ontario jets off at 9:26 pm and lands at 11:58 pm.

Good to know

Low season

January

High season

June

Cheapest flight

C$ 108
Best time to beat the crowds (8% less expensive on average)
Most popular time to fly and prices are also 9% lower on average.
Flight from Seattle to Ontario

When to book flights from Seattle to Ontario

Are your dates flexible? Find out the best times to travel from Seattle to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Seattle to Ontario

  • Does SEA have facilities for disabled traveling passengers?

    You can use the sunflower lanyard program when you're departing from Seattle to Ontario and need assistance at the SEA airport. This program is available to passengers with hidden disabilities who need extra help with check-ins, security screening, and carrying luggage. If you'd like to use the service, you can request sunflower lanyards at the pre-security information desk, between checkpoints 3 and 4, or the post-security information desk in Concourse A.

  • Does Ontario Airport have pet relief areas?

    Once you land in Ontario, you can use the pet relief areas inside and outside the terminals if your pet needs relief. The outside areas are at the far end of the terminal buildings. The areas inside are near gates 210 and 410. The relief areas have waste disposal bags and bins, which you can use to clean after your pet.

  • Is there public transportation available from Ontario Airport?

    Ontario has a well-designed bus and rail transportation service. If you'd like public transport from ONT, you can use the public buses boarded at terminal 2. The buses are available every 20min.

  • Does Ontario Airport have a USO Military Lounge?

    The USO military lounge is a space for military members and their families to sit and relax. Families can access free internet services, entertainment, and food and drinks. The ONT USO lounge is across parking lot F.

  • What is the cheapest flight from Seattle to Ontario?

    In the last 3 days, the lowest price for a flight from Seattle to Ontario was C$ 79 for a one-way ticket and C$ 85 for a round-trip.

  • Which airports will I be using when flying from Seattle to Ontario?

    Seattle airport is called Seattle/Tacoma Intl and the only airport in Ontario is Ontario.

  • Which airlines offer Wi-Fi service onboard planes from Seattle to Ontario?

    Alaska Airlines, Delta, American Airlines, and JetBlue offer inflight Wi-Fi service on the Seattle to Ontario flight route.

  • Which aircraft models fly most regularly from Seattle to Ontario?

    The Boeing 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Seattle to Ontario flight route.

  • Which airline alliances offer flights from Seattle to Ontario?

    oneworld, and SkyTeam are the airline alliances operating flights between Seattle and Ontario, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from Seattle to Ontario?

    There are direct flights from Seattle to Ontario on a daily basis.

  • Which is the best airline for flights from Seattle to Ontario, Alaska Airlines or Delta?

    The two airlines most popular with KAYAK users for flights from Seattle to Ontario are Alaska Airlines and Delta. With an average price for the route of C$ 271 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of C$ 284 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from Seattle to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Seattle with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

KAYAK’s top tips for finding a cheap flight from Seattle to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 112 or less one-way and C$ 102 or less round-trip.
  • Seattle Airport (SEA) has made it easy for travelers departing from the airport and are interested in parking their cars. The airport has a pre-booking system that allows travelers to book a parking spot before arriving at the airport. You can use this feature through the airport's website.
  • When departing to Ontario from Seattle Airport, saving time at TSA screening is a priority. Fortunately, SEA has a service that allows passengers to reserve a screening spot through the SEA Spot Saver. Reservations and walk-in appointments for departing passengers are available from 5 am to 1 pm every day at checkpoints 2, 3, and 5 for all airlines.
  • There are various transport options when you land at Ontario Airport (ONT). You can pick up a rental car from the rental car facility. ONT has airport shuttles that ferry passengers from the terminals to the on-airport rental car center. The shuttles run every 5-20min and are at the Terminal Islands of terminals 2 and 4.
  • Waiting for your flight to Ontario at the Seattle Airport can be overwhelming. You can stay in the sensory room if you need a calming environment to minimize anxiety. The room is at the train level of the A gates STS Station.
  • Every day, people face life challenges. The busyness at the airport, waiting for a flight, going through security, and checking in can add to the stress. Seattle Airport has realized this and has a beautiful therapy dogs service. The airport has partnered with Pet Partners program, where Pet Partners and their trained animals offer animal therapy at the airport. A friendly dog face or hug goes a long way to reducing stress.
See more tips

Prefer to fly non-stop from Seattle to Ontario?

Find which airlines fly direct from Seattle/Tacoma Intl to Ontario, which days they fly and book direct flights.

Nonstop departures

Seattle/Tacoma Intl to Ontario

Monday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Tuesday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Wednesday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Thursday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Friday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Saturday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Sunday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

See more nonstop flights

Nonstop returns

Ontario to Seattle/Tacoma Intl

Monday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Tuesday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Wednesday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Thursday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Friday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Saturday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

Sunday

Alaska Airlines,Delta,Frontier, +6 more

Alaska Airlines,Delta, +7 more

See more nonstop flights
See more nonstop flights

Top 3 airlines serving from Seattle to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9157 reviews
7.3Food
8.2Boarding
7.9Comfort
7.3Entertainment
8.6Crew
Airline reviews

They canceled my flight going back to SF after I was at the airport. Wanted me to take a flight 14 hours later. Not a happy camper.

2.0 MediocreRandy, May 2024SEA - SFO
Read more about Alaska Airlines reviews

They canceled my flight going back to SF after I was at the airport. Wanted me to take a flight 14 hours later. Not a happy camper.

Flight cancelled an hour before takeoff due to "unscheduled maintenance". New flight makes me have to wait for 5 hours in the airport, at a gate totally on the other side of where I'm at, requiring me to take a tram to get from the N terminal, to the C terminal. After waiting for 5 hours I'm informed my new flight is no longer at the gate I'm at, but instead is back in the N terminal where I was previously.

My baggage was in another flight, anit was delayed for one hour.

Up on arrival, due to twisted ankle, I wasn’t able to walk. Requested for a wheelchair. They immediately asked for it. After 10 minutes wait a young man named Carlos picked me up at the gate, got my baggage and took me to the pick up area. It was a great service. Thanks Alaska Air line

Good. Quiet. Comfortable. The protests nearly kept me from catching my flight. They waited for me! I made it!

I tried to cancel my flight weeks in advance round trip and told I was not able to. $400 down the drain

wish Airlines would board the plane starting in the back first. Makes more sense and I think it would be faster, NO? Everything else was great!

I went Premium otherwise it would have been a long wait. On board I only asked for a cup of hot water and got lukewarm. Cabin crew have poor to no service. But great flight; it went smooth.

I appreciated the check-in at SEATAC - a knowledgeable person was available. I found it easy to ask questions as I went along. I hadn't been at SEATAC for a year and was not that familiar. Parking was fine at Sacramento

My baggage arrived at the airport on an earlier flight. It would have been nice if I would have gotten a text. I waited until all the luggage had arrived before Ivwent to the baggage counter!

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

Had a broken tray in business class. Crew just shrugged it off.

Everything was great except for the seat. The backrest would not stay in the upright position.

public website still broken for years randomly blocking browsers with privacy options active after loading a page maybe once. check-in on laptop was almost impossible but eventually randomly worked. had to print pass at airport since couldn't get back in to load digital pass on mobile firefox or chrome. red eye flight so smooth onboarding, plenty of room to spread out, easy offboarding. onboard wifi instructions mention vpn can cause problems connecting but fails to also mention private dns. no printed or built in menu list, seems weird to require personal device to point at qr code link for menu which does not even allow direct ordering. people with health condition risk related dietary restrictions trying to avoid for example cholesterol and sugar are left guessing what they can order either way without nutritional info highlights (cranberry juice was minute maid cocktail with as much suger as typical can of soda). tap to pay wasn't working and always seems sketchy to manually enter card info. good movie variety, so limited tv was okay.

Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.

Flight diverted in SD. Later take off in Seattle by 1.3hrs

Mi primera conexión se retrasó por lo cual perdí mi segunda conexión la cual salió adelantada

Crew was not friendly when I went to request a seat change.

There were choices for the snacks. Good choices and tasty lunch and breakfast as well.

The flight crew was amazing. I’m very tall and they moved me to an exit row unsolicited!!! Amazing service.

Check in online was easy. Seats aren’t very comfortable

Fecal matter in seat back pocket. Presumably from a kids diaper.

Worst airline to travel with. They treat you like a prisoner in a jailhouse barking out orders and threats. Nickle and dime you to the same price or higher than a respectable airline like one of the big 3 . Might as well fly with standard airlines

Well I mean u get what u pay for so 🤷‍♂️

Over an hour delay in departure but I was notified beforehand. Another delay on tarmac upon arrival at LGA. We ended up departing the plane almost 2 hours later than expected

I fly Frontier because it’s affordable. I understand that the seats are tight and not the most comfortable…but that’s part of it. The problem with this flight was that there was a group of travelers directly behind me at the back of the plane who were ridiculously loud and obnoxious the entire flight. I’m pretty sure they were drunk and I could periodically smell an odd odor that I believe was one of them using a smokeless vape pen. The stewards had to remind them to keep quiet during the pre-flight instruction, but that was it. They never said another thing to them for the rest of the flight. It was a miserable.

I checked a bag because it was $5 less than carry on. They managed to lose my bag on a 2.5 hr direct flight! Frontier has no airport staff at baggage claim to help. As soon as I got home around 11 pm I tried to use their online system to file the claim for lost bag - system wouldn't take the # on my baggage claim ticket - said it was not the correct number. Also said that I had not checked a bag, which wasn't true - even my online boarding pass showed that I had checked a bag. Wasted about an hour on that process with no luck. Tried again in the morning - same thing. So tried online chat with Frontier bot - waited 35-40" twice to be connected to a baggage agent and it never happened. Eventually drove to PDX after work and waited 2 hrs for the Frontier ticket agents to arrive prior to the next Frontier flight out of PDX and FINALLY got some help from one of them, to take me to lost luggage area where I was able to retrive my bag. Probably took 4-5 hrs. of my time and endless frustration to get my bag. This was my first -- and LAST -- experience flying Frontier Airlines. Check-in was also extremely difficult and time consuming. The flight itself (and staff) were fine but everything else about the experience was a total disaster! The fact that Frontier literally has NO WAY to connect to a human voice for customer service (in this case for lost luggage) is the WORST!!!!!

Frontier is a crappy airline nothing about it is honest

I didn't get to do this flight l, hard to review

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

Book cheap flights from Seattle to Ontario

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Seattle to Ontario found on KAYAK in the last 72 hours.
18/6Tue
directDelta
2h 45mSEA-ONT
C$ 108
13/8Tue
1 stopDelta
4h 29mSEA-ONT
C$ 120
16/6Sun
directDelta
2h 45mSEA-ONT
C$ 135
10/7Wed
1 stopDelta
6h 42mSEA-ONT
C$ 147
16/7Tue
directAlaska Airlines
2h 33mSEA-ONT
C$ 155
23/10Wed
1 stopAlaska Airlines
6h 12mSEA-ONT
C$ 195
27/5Mon
directFrontier
2h 44mSEA-ONT
C$ 202
27/5Mon
directFrontier
2h 44mSEA-ONT
C$ 203
5/6Wed
2 stopsUnited Airlines
17h 22mSEA-ONT
C$ 331
5/6Wed
3 stopsUnited Airlines
30h 02mSEA-ONT
C$ 481

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Last minute flights from Seattle to Ontario

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Seattle to Ontario that are departing in the next 10 days.
17/5Fri
directFrontier
2h 44mSEA-ONT
20/5Mon
directFrontier
2h 53mONT-SEA
C$ 377
17/5Fri
directFrontier
2h 44mSEA-ONT
20/5Mon
multi-stopFrontier
10h 51mONT-SEA
C$ 433
17/5Fri
directFrontier
2h 44mSEA-ONT
19/5Sun
multi-stopFrontier
7h 41mONT-SEA
C$ 474
17/5Fri
multi-stopFrontier
9h 10mSEA-ONT
20/5Mon
multi-stopFrontier
10h 51mONT-SEA
C$ 559
17/5Fri
multi-stopFrontier
9h 10mSEA-ONT
19/5Sun
multi-stopFrontier
7h 41mONT-SEA
C$ 599
17/5Fri
directAlaska Airlines
2h 30mSEA-ONT
23/5Thu
directAlaska Airlines
2h 41mONT-SEA
C$ 623
17/5Fri
multi-stopAlaska Airlines
5h 30mSEA-ONT
23/5Thu
directAlaska Airlines
2h 41mONT-SEA
C$ 635
21/5Tue
directDelta
2h 39mSEA-ONT
22/5Wed
directDelta
3h 00mONT-SEA
C$ 670
21/5Tue
multi-stopDelta
6h 43mSEA-ONT
23/5Thu
directDelta
3h 00mONT-SEA
C$ 751
17/5Fri
multi-stopUnited Airlines
8h 03mSEA-ONT
20/5Mon
multi-stopUnited Airlines
31h 21mONT-SEA
C$ 969

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Seattle - Ontario Flights

Departure:

Seattle (undefined)United States

Destination:

Ontario (ONT)United States

Cabin classes:

C$ 78

Browse origins:

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  • Seattle

Browse destinations:

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  • Ontario