SEA - DEN

C$ 94 Find Cheap Flights from Seattle to Denver

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 Denver departing on 3/6. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Denver

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Denver, 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 Denver, as well as popular online travel agencies
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Cheap Flight Deals from Seattle to Denver (SEA-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Denver that are departing in the next months. 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 Denver

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to Denver.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
Frontier Logo
7:48 p.m. - 11:41 p.m.SEA-DEN
2h 53mdirect
Frontier Logo
9:36 p.m. - 11:44 p.m.DEN-SEA
3h 08mdirect
C$ 216Frontier
Find Deal
Sat, 14 Jun - Tue, 17 Jun
Frontier Logo
12:31 p.m. - 4:24 p.m.SEA-DEN
2h 53mdirect
Frontier Logo
10:36 p.m. - 12:44 a.m.DEN-SEA
3h 08mdirect
C$ 254Frontier
Find Deal
Fri, 16 May - Mon, 19 May
United Airlines Logo
7:00 a.m. - 2:59 p.m.SEA-DEN
6h 59m1 stop
United Airlines Logo
8:32 p.m. - 10:30 p.m.DEN-SEA
2h 58mdirect
C$ 281United Airlines
Find Deal
Wed, 21 May - Tue, 27 May
Alaska Airlines Logo
11:20 a.m. - 6:09 p.m.SEA-DEN
5h 49m1 stop
Alaska Airlines Logo
6:00 a.m. - 8:01 a.m.DEN-SEA
3h 01mdirect
C$ 286Alaska Airlines
Find Deal
Sat, 7 Jun - Sat, 14 Jun
Alaska Airlines Logo
7:55 a.m. - 11:39 a.m.SEA-DEN
2h 44mdirect
Alaska Airlines Logo
2:30 p.m. - 4:30 p.m.DEN-SEA
3h 00mdirect
C$ 292Alaska Airlines
Find Deal
Sat, 18 Oct - Sat, 18 Oct
United Airlines Logo
7:00 p.m. - 10:51 p.m.SEA-DEN
2h 51mdirect
United Airlines Logo
5:30 a.m. - 10:48 a.m.DEN-SEA
6h 18m1 stop
C$ 294United Airlines
Find Deal
Wed, 2 Jul - Wed, 16 Jul
Delta Logo
2:54 p.m. - 6:49 p.m.SEA-DEN
2h 55mdirect
Delta Logo
7:50 p.m. - 9:56 p.m.DEN-SEA
3h 06mdirect
C$ 299Delta
Find Deal
Sat, 30 Aug - Wed, 3 Sep
Delta Logo
7:40 p.m. - 11:24 p.m.SEA-DEN
2h 44mdirect
Delta Logo
6:15 a.m. - 8:26 a.m.DEN-SEA
3h 11mdirect
C$ 300Delta
Find Deal
Thu, 16 Oct - Sun, 19 Oct
Southwest Logo
11:55 a.m. - 6:40 p.m.SEA-DEN
5h 45m1 stop
Southwest Logo
7:50 a.m. - 3:10 p.m.DEN-SEA
8h 20m1 stop
C$ 325Southwest
Find Deal
Sat, 30 Aug - Wed, 3 Sep
Southwest Logo
7:50 p.m. - 11:30 p.m.SEA-DEN
2h 40mdirect
Southwest Logo
7:55 p.m. - 1:30 a.m.DEN-SEA
6h 35m1 stop
C$ 328Southwest
Find Deal
Thu, 26 Jun - Sun, 29 Jun

Expert advice for your flight from Seattle to Denver

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are specific to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Frontier

Frontier's Premium Bundle includes priority boarding and extra legroom for just CA$27 more than Economy.


Avoid Basic Fare to prevent extra fees; Economy Bundle offers carry-on and seat choice.

Read more about Frontierby Stefanie Waldek
Alaska Airlines

Alaska's 20-minute bag guarantee offers bonus miles if bags aren't delivered promptly at baggage claim.


Alaska's Premium Class offers extra legroom and complimentary drinks on flights over 350 miles.

United Airlines

United's Economy Plus offers 15 cm more legroom than standard economy, enhancing comfort on short flights.


Purchase Priority Boarding to ensure overhead bin space, especially if you're in a higher boarding zone.

Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Frontier and United Airlines

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more

KAYAK's insights & trends for Seattle to Denver flights

Get data-powered insights and trends into flights from Seattle to Denver 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 Denver?

The average price of all round-trip flights from Seattle to Denver clicked on KAYAK for each day over the last 12 months.
When flying from Seattle to Denver, you should consider leaving on a Monday and avoid Sundays if you are looking for the best rates. For your return to Seattle, you’ll find the best rates on Saturdays and the most expensive ones on Tuesdays.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Denver, 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 Denver is September, where tickets cost C$ 218 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is C$ 351 and C$ 300 respectively.

Can I save money by flying with a layover from Seattle to Denver?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.
No, with an average price for the route of C$ 357, prices are generally cheapest when you fly direct.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Denver, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.
To get a below average price on the flight from Seattle to Denver, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Good to know

Low season

January

High season

May

Cheapest flight

C$ 94
Best time to beat the crowds (6% less expensive on average)
Most popular time to fly (1% more expensive on average)
Flight from Seattle to Denver

When to book flights from Seattle to Denver

Are your dates flexible? Find out the best times to travel from Seattle to Denver 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.

Flights from Seattle to Denver: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Seattle to Denver 
Verified travelerFlew with Alaska AirlinesSEA-DENMar 2025
Alaska Air is very efficient & on-time so allow enough time to get luggage, go thru Customs & Immigration, & long security lines. Terminals in SEA are readily accessible by trains but more signage is needed. Fortunately, Information booths are everywhere & are manned by very helpful staff.
MichaelFlew with DeltaSEA-DENApr 2025
Train from Denver airport to downtown is easy to use.
Verified travelerFlew with Alaska AirlinesSEA-DENDec 2024
I didn’t have any problems using Alaska Airlines
Verified travelerFlew with Alaska AirlinesSEA-DENMay 2024
When flying from Seattle to Denver, be ready to take our any electronics and put them in separate bins when going through security. You will also most likely have to take off your jacket as well. During our flight back the flight randomly changed so be on the lookout in case that happens to you! It was by chance that I checked my ticket and saw that the gate changed last minute.

FAQs for booking flights from Seattle to Denver

  • Is there anywhere to smoke at Seattle-Tacoma International Airport?

    While smoking is not allowed inside any of the terminals at Seattle-Tacoma International Airport, there are two locations outside where you may smoke. The first is near the north end of the baggage claim level, and the second is across from the small parking lot. To determine if you are allowed to smoke, look for ashtrays and double check that there are no airport signs prohibiting it.

  • What is there to do while waiting at Seattle-Tacoma International Airport?

    In addition to periodic live music performances, Seattle-Tacoma International Airport also has a diverse Art Walk that is 0.5 mi long and begins near Gate A 14. There are also several Digiboo self-service kiosks located throughout the airport that allow travelers to download movies and televisions shows directly onto their portable devices.

  • Are there any amenities for pets at Denver International Airport?

    There are several pet relief zones located in the centers of Terminals A, B, and C at Denver International Airport and they provide pet owners with waste disposal bags, trashcans, and running water. Additionally, there is a Paradise 4 Paws Pet Resort adjacent to the main terminal that offers both pet boarding and grooming services.

  • Where can I grab a meal at Denver International Airport?

    Boulder Beer Tap House is located in the Jeppesen Terminal of Denver International Airport and serves a selection of burgers, appetizers, and salads, while Cantina Grill is located nearby and has a Mexican-inspired menu. The Denver Chophouse is located near the A Gates and is known for its vegan and gluten-free meals.

  • What is the cheapest flight from Seattle to Denver?

    In the last 3 days, the lowest price for a flight from Seattle to Denver was C$ 68 for a one-way ticket and C$ 156 for a round-trip.

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

    Alaska Airlines, Hawaiian Airlines, Delta, American Airlines, and Aeromexico offer inflight Wi-Fi service on the Seattle to Denver flight route.

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

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

  • Which airline alliances offer flights from Seattle to Denver?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Seattle to Denver are Alaska Airlines and Delta. With an average price for the route of C$ 312 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$ 238 and an overall rating of 8.0.

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

    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 Denver.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver 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 Denver?

    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 Denver 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 Denver?

    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 Denver 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 Denver

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 137 or less one-way and C$ 265 or less round-trip.
  • For travelers looking for non-stop flights from Seattle to Denver, book your reservation with either United, Delta, or Frontier Airlines, as each of these companies offers many flights without layovers. If you would like some extra perks, look into flying with Southwest Airlines, as they provide free checked baggage and snacks.
  • If you’re trying to find a way to pass the time before boarding your flight from Seattle to Denver, purchase an entry ticket for the Club at SEA in Seattle-Tacoma International Airport (SEA). This lounge is open to customers of all airlines and provides guests with snacks, magazines, televisions, and games.
  • Have a question about the airport or need help finding a specific service? Look for the Airport Volunteers stationed throughout Seattle-Tacoma International Airport in bright blue jackets. These volunteers can help you find your gate, recommend dining options, and tell you about the airport’s various amenities.
  • If you are feeling sore after being cooped up in a plane for several hours, consider getting a quick massage at A Massage in Denver International Airport (DEN). With two locations near the A and B Gates, this massage parlor is a quick and convenient way to let go of any tension and stress.
  • For those that are traveling with a small child, take note of the fact that there are private nursing rooms located in each terminal of Denver International Airport. These rooms contain seating, outlets, changing tables, and sinks, and they are free to access.
See more tips

Prefer to fly direct from Seattle to Denver?

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

Direct departures

Seattle/Tacoma Intl to Denver Intl

Monday

ANA,Air Tahiti Nui,Alaska Airlines, +19 more

ANA,Air Tahiti Nui, +20 more

Tuesday

ANA,Air France,Air Tahiti Nui, +16 more

ANA,Air France, +17 more

Wednesday

ANA,Air France,Air Tahiti Nui, +19 more

ANA,Air France, +20 more

Thursday

ANA,Air France,Air Tahiti Nui, +18 more

ANA,Air France, +19 more

Friday

ANA,Air Tahiti Nui,Alaska Airlines, +19 more

ANA,Air Tahiti Nui, +20 more

Saturday

ANA,Air France,Air Tahiti Nui, +19 more

ANA,Air France, +20 more

Sunday

ANA,Air France,Air Tahiti Nui, +20 more

ANA,Air France, +21 more

See more nonstop flights

Direct returns

Denver Intl to Seattle/Tacoma Intl

Monday

ANA,Air France,Air Tahiti Nui, +18 more

ANA,Air France, +19 more

Tuesday

ANA,Air France,Air Tahiti Nui, +15 more

ANA,Air France, +16 more

Wednesday

ANA,Air France,Air Tahiti Nui, +18 more

ANA,Air France, +19 more

Thursday

ANA,Air France,Air Tahiti Nui, +17 more

ANA,Air France, +18 more

Friday

ANA,Air France,Air Tahiti Nui, +18 more

ANA,Air France, +19 more

Saturday

ANA,Air France,Air Tahiti Nui, +18 more

ANA,Air France, +19 more

Sunday

ANA,Air France,Air Tahiti Nui, +19 more

ANA,Air France, +20 more

See more nonstop flights
See more nonstop flights

Top 5 airlines serving from Seattle to Denver

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Denver. 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 Denver? 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 9911 reviews
8.2Boarding
8.5Crew
7.1Entertainment
7.9Comfort
7.1Food
Airline reviews

Awful. We got the last seats and they don't recline. We've been on this horrible journey since 6am and won't get to our destination almost a full day later. Oh and no food, either. Never again.

2.0 MediocreDeb, Apr 2025SEA - HNL
Read more Alaska Airlines reviews

Awful. We got the last seats and they don't recline. We've been on this horrible journey since 6am and won't get to our destination almost a full day later. Oh and no food, either. Never again.

An uneventful flight is a good experience although one of the pilots gauges wasn’t working right so we had a half hour delay—no one can foresee that.

Plane was delayed and got me in past bedtime. But more importantly, my tsa precheck number wasn’t on my ticket so had to deal with the general line. Oh well, guess the delay helped that situation.

It was as good as flying can be, which is still very uncomfortable. Clean new aircraft, great crew.

Everything was good. The flight attendants were great. I was disappointed that there wasn’t any screens on the back of the seats to watch movies, tv, etc. I only had my phone to watch movies on.

Flight delayed due to engine issue. For 3+ hours still not on flight

Could have had more of a beverage selection than water and apple juice.

They only had one flight to my destination for the entire day. Six hour layover. Coming from their sister airline we didn't have any boarding grouping on our boarding tickets. Had to ask where we were within the grouping.

Flight was over an hour late, and we got notified every 15 minutes, beginning right at boarding, that it would only be 15 more minutes until we finally left about 75 minutes late. Of course, no compensation was offered.

Just in first class they offer blanquets, for main cabin there was no blanquets even if I would buy them

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

The price of the tickets isn't matching the flight experience. No matter how long the flight is, you're only getting pretzels. The flight attendants looked unkept and over it.

Plz don't take away free bags and free seating

The seats were a bit cramped and worn, but otherwise okay.

I would have liked to arrive on time - not 5 hours late!

After a 3 hour layover in Denver my flight was delayed over 5 hours! No explanation; no assistance; no offer to provide compensation; no one at Southwest was willing to offer any assistance. 8 hours in the Denver airport - ridiculous!

It was a perfect flight in all aspects! Both legs!

Only one drink pass through the cabin for a 4 hour flight. Quite rough and bumpy landing.

WiFi on the flight was not working. Thus, entertainment options were limited.

I really like open seating. I hate that I've heard this is going away. This is one of the unique things that makes Southwest my goto choice.

Delta flight was on time, seats were comfortable, and crew was nice.

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.

A little bumpy ride . No food was being provided due the the turbulence. That was ok it was a short flight to my standards.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

The Dekta Rep that checked us in was great. She's very personable, pleasant, and can tell she enjoys her job.

The plane was old with small storage areas that had problems closing/latching and not enough storage for everyone, and worn, damaged seats. Service was great but feel a little unsafe on such well used planes.

Terrible and im avoiding them in the future. My initial flight was delayed causing me to rebook my flight and when speaking with the representative to rebook I explained this is the second time my flights were delayed and they did nothing to help me. I wasn't booked to comfort plus or given a voucher or anything. I was almost late for my meeting that I needed to attend on Monday because of the games delta played delaying my flights even more and putting me in the very back of the plane next to an extremely intoxicated passenger

Flights on time. .Ride was as comfortable as can be expected in steerage. Luggage arrived at destination. Attendants were fairly friendly.

Food choices were very limited. Taste of the dishes was average.

I liked all the informational texts. I always knew where to go and when .

Received an email the night before showing that there would be seatback entertainment on our flight. We get on and there was no seatback entertainment. And then it was a scramble to try to set up the iPads for the kids before takeoff so they could watch something for the four hour flight.

The reason I don’t fly United. No in seat entertainment for a long flight and inconsistent WiFi and entertainment available from my device.

It was a good flight. Nothing comes to mind about how it could have been better. It was a newer plane, seemed like a great upgrade from your older ones. Staff was very good as well.

The food for long haul was poor compared to Singapore airlines economy. Pasta plain with tomato sauce . Singapore airlines give me Hagen dash small ice cream cup it was great. The choices of dinner course Singapore air also much better The crew mostly friendly. The economy seat are as expected.

The plane was clean. The staff was excellent. The flight attendants were very good. Enjoyable flight. Overall. The seats in the back are too small but, will always be.

Flight was 3 1/2 hour delayed with no credit or meal vouchers

late departure due to some unspecified issue with ventilating the cabin. They got it running but it was FREEZING for the whole flight. I asked for a blanket but they didn't provide one. They could not turn up the heat. it was quite miserable.

Liked that we left on time for each flight. Snacks not the best, but we're okay.

Seats are uncomfortable but price is good. Guess I can put up with misery for four hours.

The plane failed preflight inspection, so we sat there for 90 mins while they tried to fix it. Ultimately, everything was remedied and we made our connecting flight; instead of a 2 hour layover at the airport, we spent it waiting on the plane.

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

The seats were extremely hard and uncomfortable. It was disappointing even for a budget airline.

Delayed each time on a round trip with no significant weather interference. Updates to flight times came after the fact. 30 min behind in boarding and board and phone still show an on time departure. Some mysterious extra 300 miles that came so surprising they had to fuel while we were already on board?

Our flight was canceled for no known reason. We weren’t told until we were checking in at 5:00 am. This was after our last flight with Frontier where we sat on the plane for three hours (not an exaggeration) before we took off because of a mechanical issue. We won’t be flying Frontier again.

Allowed me to chose my seat without extra charge (I purchased full-price ticket) and boarding was in group1. Didn't even serve water.

Stuck in Phoenix for two days, not even a hotel voucher offered.

Every day about it was very different all the boarding pass where all wrong l miss flight no refund all crazy

Flight got delayed for 3.5 hours, and for the first hour after the departure time there was no update from the gate folks...

Everything you need to know for your flight from Seattle to Denver

Information on your arrival and departure airports

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