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Cheap flights from Seattle to Philadelphia from C$ 240

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
7 Sep — 14 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Philadelphia

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Philadelphia
Explore the most affordable flight options available from Seattle to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 August 2026.

Sat 5/911:05 p.m. -
1 stop9h 40m
Sat 12/93:40 p.m. -
1 stop8h 15m
Deal found 8/8C$ 460
Fri 11/95:15 a.m. -
1 stop9h 40m
Mon 14/912:45 p.m. -
2 stops11h 05m
Deal found 4/8C$ 467
Fri 23/109:05 a.m. -
1 stop9h 10m
Fri 30/106:46 p.m. -
1 stop8h 00m
Deal found 7/8C$ 482
Thu 10/911:00 p.m. -
1 stop8h 02m
Tue 15/95:01 p.m. -
1 stop8h 44m
Deal found 7/8C$ 485
Wed 9/911:05 p.m. -
2 stops11h 10m
Tue 15/912:35 p.m. -
1 stop8h 35m
Deal found 7/8C$ 492
Fri 23/109:15 p.m. -
2 stops10h 45m
Fri 30/1012:35 p.m. -
2 stops12h 55m
Deal found 7/8C$ 496
Wed 16/911:05 p.m. -
2 stops11h 10m
Sat 19/911:55 a.m. -
2 stops9h 25m
Deal found 3/8C$ 499
Thu 17/911:00 p.m. -
1 stop12h 30m
Mon 5/105:10 p.m. -
2 stops10h 45m
Deal found 7/8C$ 500
Fri 4/99:27 p.m. -
Nonstop5h 13m
Mon 28/96:59 p.m. -
Nonstop5h 52m
Deal found 4/8C$ 502
Wed 9/911:04 p.m. -
1 stop7h 39m
Thu 17/99:30 a.m. -
1 stop9h 37m
Deal found 5/8C$ 506
Fri 18/911:05 p.m. -
1 stop9h 10m
Mon 21/96:05 p.m. -
1 stop8h 50m
Deal found 4/8C$ 507

Find flight deals from Seattle to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Philadelphia (PHL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 8 August 2026.

Round-trip from

C$ 460

One-way from

C$ 240

Popular in

December

Cheapest in

October

Average price

C$ 653

Good round-trip deal

C$ 395 or less
Southwest
  • Southwest
  • 5/9-12/9
  • 2 total stops
  • 17h 55m total
  • Seattle to Philadelphia
Search Deals
Frontier
  • Frontier
  • 1/9
  • 2 total stops
  • 27h 09m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 7 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Philadelphia.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Philadelphia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 8 August 2026.
Use the filters below to find and compare flights from Seattle to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 14/10

12:10 a.m.-10:50 a.m.

1 stop7h 40m

Philadelphia

Sat 17/10

5:25 a.m.-2:30 p.m.

2 stops12h 05m

C$ 492

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 16/9

11:05 p.m.-1:15 p.m.

2 stops11h 10m

Philadelphia

Tue 22/9

2:45 p.m.-11:10 p.m.

2 stops11h 25m

C$ 499

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Fri 18/9

9:30 p.m.-5:50 a.m.

Nonstop5h 20m

Philadelphia

Mon 5/10

7:05 a.m.-9:56 a.m.

Nonstop5h 51m

C$ 502
Quickest round-trip

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Fri 11/9

9:27 p.m.-5:40 a.m.

Nonstop5h 13m

Philadelphia

Sun 27/9

7:00 a.m.-9:51 a.m.

Nonstop5h 51m

C$ 502

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 22/10

9:29 p.m.-5:37 a.m.

Nonstop5h 08m

Philadelphia

Sun 25/10

7:00 a.m.-9:58 a.m.

Nonstop5h 58m

C$ 502

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Fri 6/11

7:35 p.m.-7:39 a.m.

1 stop9h 04m

Philadelphia

Tue 10/11

1:20 p.m.-7:03 p.m.

1 stop8h 43m

C$ 507

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 30/9

11:05 p.m.-10:50 a.m.

1 stop8h 45m

Philadelphia

Fri 2/10

7:10 p.m.-12:35 a.m.

1 stop8h 25m

C$ 507

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 1/10

12:10 a.m.-10:50 a.m.

1 stop7h 40m

Philadelphia

Tue 6/10

5:30 a.m.-10:50 a.m.

1 stop8h 20m

C$ 507

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Mon 21/9

11:05 p.m.-11:35 a.m.

1 stop9h 30m

Philadelphia

Fri 25/9

4:05 p.m.-11:00 p.m.

1 stop9h 55m

C$ 507

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 9/9

9:30 p.m.-5:50 a.m.

Nonstop5h 20m

Philadelphia

Tue 29/9

5:27 p.m.-10:05 p.m.

1 stop7h 38m

C$ 516

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/8

Showing 1-10 of 22 resultsSorted by cheapest first
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Best time to book a flight from Seattle to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

The best time to book flights from Seattle to Philadelphia is 80 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to Philadelphia?

Currently, October is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 461). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 726). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to PHL?

Find hourly flight availability from Seattle to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 8 August 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Philadelphia as you normally would.

How much does it cost to fly round-trip from Seattle to Philadelphia?

Airfare is below average for this route at the moment.

Seattle to Philadelphia flights typically cost between C$ 521 and C$ 816 in September.
The cheapest round-trip price found within the last 5 days was C$ 460 on Southwest (5 Sep-12 Sep).

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Philadelphia. Reviews last updated 8 August 2026.
Get a feel of what it's like to fly with Alaska Airlines from Seattle to Philadelphia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,783 reviews
Check prices

Boarding

8.1

Overall

7.9

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Alaska Airlines
7.9
Good
12,783 reviews
Alaska Airlines
7.9
Good
12,783 reviews
Check prices

Boarding

8.1

Overall

7.9

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Seattle to Philadelphia?

    If you book a flight from Seattle to Philadelphia, you will be flying from Seattle/Tacoma Intl to Philadelphia. Flights to Philadelphia (PHL) from Seattle/Tacoma Intl (SEA) take 5h 20m for a nonstop flight. There are 7 flights from Seattle/Tacoma Intl to Philadelphia per day from 1 airline.

  • How popular is this Seattle to Philadelphia flight route?

    This flight path from Seattle/Tacoma Intl to Philadelphia was viewed by 8 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Seattle to Philadelphia?

    For as low as C$ 502, United Airlines can have you in Philadelphia from Seattle in 5h 20m. Seattle and Philadelphia are separated by a distance of 3814 km. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Seattle to Philadelphia round-trip?

    Our cheapest airline available from Seattle to Philadelphia is Alaska Airlines. Our recent data shows that you can find tickets from as low as C$ 284 on this airline. Alaska Airlines is currently priced 50% below the average price you’ll pay for this route.

  • What are the most reliable airlines from Seattle to Philadelphia?

    Before booking your flight to Philadelphia from Seattle, check out the most reliable airlines to get you to your destination on time: KLM (100%), Finnair (100%), STARLUX Airlines( 90%).

  • What are the cheapest flights from Seattle to Philadelphia?

    Looking for the cheapest flight from Seattle to Philadelphia? While on average our users pay C$ 460, our data indicates the cheapest price to be C$ 395. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 628.

  • Can I find deals for flights from Seattle to Philadelphia that include hotel bookings?

    Yes. In addition to deals on Seattle to Philadelphia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Philadelphia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Philadelphia.

  • Can I find deals for business class flights from Seattle to Philadelphia?

    Yes. Cheapflights offers flight deals from Seattle to Philadelphia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Philadelphia?

    Currently, October is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 461). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 726). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Voorhees
Reading
King of Prussia
Wildwood
West Chester

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Seattle to Philadelphia

Discover the top airline that operate flights from Seattle to Philadelphia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 8 August 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 284AverageC$ 541FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Philadelphia?

Cheapflights helps you search for flights from Seattle to Philadelphia via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Philadelphia?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Seattle to Philadelphia for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Seattle to Philadelphia with no change fees?

Yes, we can. To see specific flights from Seattle to Philadelphia with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Philadelphia become cheaper?

Yes! Start tracking prices for Seattle to Philadelphia flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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