SEA - PHL

C$ 138 Find Cheap Flights from Seattle to Philadelphia

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 Philadelphia departing on 16/5. 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 Philadelphia

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Philadelphia 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 Philadelphia

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to Philadelphia.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
Delta Logo
6:00 a.m. - 5:09 p.m.SEA-PHL
8h 09m1 stop
Delta Logo
7:05 a.m. - 2:45 p.m.PHL-SEA
10h 40m1 stop
C$ 396Delta
Find Deal
Sat, 24 May - Sat, 31 May
Delta Logo
6:00 a.m. - 6:10 p.m.SEA-PHL
9h 10m1 stop
Delta Logo
7:05 p.m. - 11:53 p.m.PHL-SEA
7h 48m1 stop
C$ 435Delta
Find Deal
Tue, 24 Jun - Wed, 2 Jul
Delta Logo
7:35 p.m. - 5:50 a.m.SEA-PHL
7h 15m1 stop
Delta Logo
6:00 a.m. - 10:28 a.m.PHL-SEA
7h 28m1 stop
C$ 445Delta
Find Deal
Fri, 23 May - Sun, 25 May
Alaska Airlines Logo
9:15 p.m. - 5:25 a.m.SEA-PHL
5h 10mdirect
Alaska Airlines Logo
6:58 p.m. - 10:00 p.m.PHL-SEA
6h 02mdirect
C$ 446Alaska Airlines
Find Deal
Tue, 12 Aug - Thu, 4 Sep
Alaska Airlines Logo
9:15 p.m. - 5:25 a.m.SEA-PHL
5h 10mdirect
Alaska Airlines Logo
6:58 p.m. - 10:00 p.m.PHL-SEA
6h 02mdirect
C$ 456Alaska Airlines
Find Deal
Tue, 12 Aug - Sat, 6 Sep
Southwest Logo
11:00 p.m. - 11:50 a.m.SEA-PHL
9h 50m1 stop
Southwest Logo
8:25 p.m. - 12:55 a.m.PHL-SEA
7h 30m1 stop
C$ 459Southwest
Find Deal
Sat, 9 Aug - Sun, 7 Sep
United Airlines Logo
5:10 a.m. - 5:22 p.m.SEA-PHL
9h 12m1 stop
United Airlines Logo
5:15 p.m. - 10:20 p.m.PHL-SEA
8h 05m1 stop
C$ 467United Airlines
Find Deal
Thu, 14 Aug - Tue, 19 Aug
United Airlines Logo
5:15 a.m. - 5:40 p.m.SEA-PHL
9h 25m2 stops
United Airlines Logo
12:25 p.m. - 6:53 p.m.PHL-SEA
9h 28m1 stop
C$ 477United Airlines
Find Deal
Tue, 20 May - Sun, 25 May
Southwest Logo
10:55 p.m. - 9:25 a.m.SEA-PHL
7h 30m1 stop
Southwest Logo
6:00 p.m. - 12:25 a.m.PHL-SEA
9h 25m2 stops
C$ 481Southwest
Find Deal
Thu, 31 Jul - Mon, 4 Aug
Sun Country Air Logo
11:59 p.m. - 10:58 a.m.SEA-PHL
7h 59m1 stop
Sun Country Air Logo
12:00 p.m. - 8:50 p.m.PHL-SEA
11h 50m1 stop
C$ 649Sun Country Air
Find Deal
Mon, 23 Jun - Sat, 28 Jun

Expert advice for your flight from Seattle to Philadelphia

 
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
American Airlines

American Airlines' Main Cabin Extra provides early boarding and complimentary drinks for a small fee.


American Airlines offers high-speed Wi-Fi for purchase, with free options for T-Mobile customers.

Alaska Airlines

Alaska Airlines offers a 20-minute baggage guarantee, ensuring quick luggage retrieval or compensation.


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

Airports
SEA

Use the SEA Spot Saver for free expedited security screening. Book online or via the flySEA app for Checkpoints 2, 3, and 5.

Read more about SEAby Harriet Baskas
PHL

Take the SEPTA Airport Line to downtown Philadelphia for a cost-effective 30-minute ride. Buy a Quick Trip or SEPTA Key card for savings.

Read more about PHLby Harriet Baskas
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on American Airlines, Alaska Airlines, PHL and SEA

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 Philadelphia flights

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Philadelphia, 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 Philadelphia is March, where tickets cost C$ 535 (return) on average. On the other hand, the most expensive months are December and February, where the average cost of round-trip tickets is C$ 809 and C$ 736 respectively.

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

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.
Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at C$ 506 on average.

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

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 Philadelphia, 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 Philadelphia, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Good to know

Low season

January

High season

July

Cheapest flight

C$ 138
Best time to beat the crowds (13% less expensive on average)
Most popular time to fly (1% more expensive on average)
Flight from Seattle to Philadelphia

When to book flights from Seattle to Philadelphia

Are your dates flexible? Find out the best times to travel from Seattle to Philadelphia 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 Philadelphia: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Seattle to Philadelphia 
Verified travelerFlew with Alaska AirlinesSEA-PHLApr 2025
Direct flight is worth the cost. Use the app. Fast and smooth.
ElaineFlew with Alaska AirlinesSEA-PHLMay 2024
If you have any metal in your body (e.g., spinal fusion screws) make sure you get in the line for the TSA security screening booth that makes you stand on the yellow marks with your arms over your head. I wish I had known this before I wasted time in the alternate line with the walk-through detector.

FAQs for booking flights from Seattle to Philadelphia

  • Where can I sleep at Philadelphia International Airport?

    Minute Suites provides private suites you can rent for an hour or two to work, relax, or take a nap after your flight. Each suite has a bed, blankets, pillows, free Wi-Fi, a phone, desk, and HDTV. The facility is located inside security on the terminal A-B link. If you are staying overnight at the airport, book your stay at the Philadelphia Airport Marriott. You can get to the hotel by taking the Sky Bridge from terminal B or the free shuttle that runs every 20 minutes from each terminal.

  • How can I get downtown from Philadelphia International Airport?

    PHL is served by the SEPTA trains and the SEPTA Regional Airport Line provides services from PHL to downtown Philadelphia. You can also take these trains to get to Amtrack connections. SEPTA also runs buses from PHL and routes 37, 108, and 115 provide regular service to downtown Philadelphia. You can also take taxis or shared rides from the ground transportation area of each terminal. Taxis operating from PHL are metered but have a minimum $10 charge for all destinations.

  • Does Seattle-Tacoma International Airport offer family services?

    SEA has provided private nursing spots for breastfeeding parents dubbed the Mothers Room. These rooms offer comfortable seating, rocking chairs, adjustable lighting, baby changing tables, and more. You’ll find the Mothers Room around the kids’ play area and there is also one in the USO lounge. SEA also provides nursing suites with the same facilities available around the S Gate mezzanine level and gates C10, N2, A9, D10, and D23. SEA has a kids’ play area between the central terminal and A Gates for the older kids.

  • Does Seattle-Tacoma International Airport offer accessibility services?

    SEA is ADA-compliant, and passengers with limited mobility have access to wheelchair assistance at the airport. These passengers will also have access to accessible transportation, accessible restrooms, stair-free pathways, reserved parking spots, and fast-track services. Low-vision passengers will have free Aira services at SEA, while hard-of-hearing passengers get visual paging and TTY telephones.

  • What is the cheapest flight from Seattle to Philadelphia?

    In the last 3 days, the lowest price for a flight from Seattle to Philadelphia was C$ 100 for a one-way ticket and C$ 287 for a round-trip.

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

    On your way to Philadelphia, you’ll fly out from Seattle/Tacoma Intl. You’ll be landing at Philadelphia.

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

    All the following airlines offer inflight Wi-Fi service on the Seattle to Philadelphia flight route: American Airlines, Alaska Airlines, Hawaiian Airlines, Delta, Lufthansa, Sun Country Air, United Airlines, Virgin Atlantic, and Air Canada.

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

    The Boeing 737 MAX 9 is the aircraft model that flies most regularly on the Seattle to Philadelphia flight route.

  • Which airline alliances offer flights from Seattle to Philadelphia?

    oneworld is the only airline alliance operating flights between Seattle and Philadelphia.

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

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

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

    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 Philadelphia.

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

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

    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 Philadelphia 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 Philadelphia?

    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 Philadelphia 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 Philadelphia

  • Seattle-Tacoma International Airport (SEA) is a major transportation hub. It has four terminals, the main and central terminals are next to each other; then there are the north and south satellite terminals. SEA has an airport train running every 10 minutes providing inter-terminal connections.
  • Are you visiting Philadelphia International Airport (PHL) with your pet? The airport has provided pet facilities known as Pet Ports at PHL. There’s at least one in each terminal after security and outdoor areas are outside the baggage claim areas and the departing flights road.
  • On average around 1,066 kg of carbon is emitted on flights from Seattle to Philadelphia. If you wish to fly more sustainably, book your flight with United Airlines. They offer an eco-friendly flight emitting 42% less carbon per passenger on this route.
  • Do you need banking or currency exchange services before your flight? US Bank runs a full-service branch at SEA. You’ll find the bank in the main terminal between security checkpoints 3 and 4.
  • If you got urgent business to attend to after your flight, visit the UPS Store at PHL. The establishment offers business services including copying, faxing, shipping, and notary services. They also have workstations with computers. The establishment is inside security around the terminal A/B walkway.
See more tips

Prefer to fly direct from Seattle to Philadelphia?

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

Direct departures

Seattle/Tacoma Intl to Philadelphia

Monday

Air Tahiti Nui,Alaska Airlines,American Airlines, +2 more

Air Tahiti Nui,Alaska Airlines, +3 more

Tuesday

Air Tahiti Nui,Alaska Airlines,American Airlines, +1 more

Air Tahiti Nui,Alaska Airlines, +2 more

Wednesday

Air Tahiti Nui,Alaska Airlines,American Airlines, +2 more

Air Tahiti Nui,Alaska Airlines, +3 more

Thursday

Air Tahiti Nui,Alaska Airlines,American Airlines, +2 more

Air Tahiti Nui,Alaska Airlines, +3 more

Friday

Air Tahiti Nui,Alaska Airlines,American Airlines, +1 more

Air Tahiti Nui,Alaska Airlines, +2 more

Saturday

Air Tahiti Nui,Alaska Airlines,American Airlines, +2 more

Air Tahiti Nui,Alaska Airlines, +3 more

Sunday

Air Tahiti Nui,Alaska Airlines,American Airlines, +2 more

Air Tahiti Nui,Alaska Airlines, +3 more

See more nonstop flights

Direct returns

Philadelphia to Seattle/Tacoma Intl

Monday

Air Tahiti Nui,Alaska Airlines,American Airlines, +4 more

Air Tahiti Nui,Alaska Airlines, +5 more

Tuesday

Air Tahiti Nui,Alaska Airlines,American Airlines, +3 more

Air Tahiti Nui,Alaska Airlines, +4 more

Wednesday

Air Tahiti Nui,Alaska Airlines,American Airlines, +4 more

Air Tahiti Nui,Alaska Airlines, +5 more

Thursday

Air Tahiti Nui,Alaska Airlines,American Airlines, +4 more

Air Tahiti Nui,Alaska Airlines, +5 more

Friday

Air Tahiti Nui,Alaska Airlines,American Airlines, +3 more

Air Tahiti Nui,Alaska Airlines, +4 more

Saturday

Air Tahiti Nui,Alaska Airlines,American Airlines, +4 more

Air Tahiti Nui,Alaska Airlines, +5 more

Sunday

Air Tahiti Nui,Alaska Airlines,American Airlines, +4 more

Air Tahiti Nui,Alaska Airlines, +5 more

See more nonstop flights
See more nonstop flights

Top airline flying from Seattle to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Philadelphia. 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 Philadelphia? 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 9906 reviews
7.1Entertainment
8.5Crew
7.1Food
8.2Boarding
7.9Comfort
Airline reviews

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.

10.0 ExcellentAldo, Apr 2025SEA - TPA
Read more Alaska Airlines reviews

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

The flight was delayed and then it was very short. The crew was nice. The seats weren't as comfortable on this particular craft.

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

Information on your arrival and departure airports

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