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Cheap flights from Seattle to Philadelphia from C$ 204

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
21 Apr — 28 Apr1
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 22 March 2026.

Tue 12/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Tue 2/67:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 17/3C$ 429
Wed 22/411:45 p.m.
SEA
-
PHL
1 stop7h 50m
Southwest
Tue 28/47:30 a.m.
PHL
-
SEA
1 stop8h 15m
Southwest
Deal found 19/3C$ 435
Wed 15/46:00 a.m.
SEA
-
PHL
1 stop8h 50m
Southwest
Wed 13/54:00 p.m.
PHL
-
SEA
2 stops10h 35m
Southwest
Deal found 17/3C$ 442
Wed 3/611:20 p.m.
SEA
-
PHL
1 stop7h 25m
United Airlines
Mon 8/66:45 p.m.
PHL
-
SEA
1 stop8h 14m
United Airlines
Deal found 18/3C$ 446
Tue 21/46:50 a.m.
SEA
-
PHL
2 stops11h 15m
Southwest
Tue 28/47:30 a.m.
PHL
-
SEA
2 stops12h 25m
Southwest
Deal found 19/3C$ 449
Fri 15/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Wed 27/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 17/3C$ 451
Sat 25/411:55 p.m.
SEA
-
PHL
1 stop7h 40m
Southwest
Wed 29/45:50 a.m.
PHL
-
SEA
2 stops10h 45m
Southwest
Deal found 20/3C$ 453
Wed 8/42:39 p.m.
SEA
-
PHL
1 stop7h 20m
United Airlines
Fri 17/46:55 p.m.
PHL
-
SEA
1 stop8h 39m
United Airlines
Deal found 18/3C$ 457
Tue 14/49:20 a.m.
SEA
-
PHL
2 stops8h 45m
Southwest
Tue 21/42:00 p.m.
PHL
-
SEA
2 stops11h 30m
Southwest
Deal found 17/3C$ 460
Mon 13/49:55 p.m.
SEA
-
PHL
Nonstop5h 10m
Alaska Airlines
Wed 13/57:16 p.m.
PHL
-
SEA
Nonstop6h 12m
Alaska Airlines
Deal found 17/3C$ 462
Mon 4/511:55 p.m.
SEA
-
PHL
1 stop7h 55m
Southwest
Thu 4/64:45 p.m.
PHL
-
SEA
2 stops11h 05m
Southwest
Deal found 18/3C$ 464

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 22 March 2026.

Round-trip from

C$ 429

One-way from

C$ 204

Popular in

December

Cheapest in

October

Average price

C$ 590

Good round-trip deal

C$ 484 or less

Good one-way deal

C$ 260 or less
Delta
  • Delta
  • 12/5-2/6
  • Nonstop
  • 11h 07m total
  • Seattle to Philadelphia
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Delta
  • Delta
  • 12/5
  • Nonstop
  • 5h 17m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Philadelphia.
Search Deals
Price to beat on a one-way 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 22 March 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 - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/7

9:31 p.m.-5:45 a.m.

Nonstop5h 14m

Philadelphia

Sun 12/7

7:08 a.m.-10:04 a.m.

Nonstop5h 56m

C$ 451
Quickest round-trip

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 20/4

9:55 p.m.-6:05 a.m.

Nonstop5h 10m

Philadelphia

Tue 28/4

7:22 a.m.-10:20 a.m.

Nonstop5h 58m

C$ 451

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 9/6

9:50 p.m.-6:05 a.m.

Nonstop5h 15m

Philadelphia

Sun 30/8

7:05 a.m.-10:04 a.m.

Nonstop5h 59m

C$ 451

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 4/6

9:20 p.m.-5:35 a.m.

Nonstop5h 15m

Philadelphia

Sun 7/6

7:05 a.m.-10:04 a.m.

Nonstop5h 59m

C$ 451

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/8

9:50 p.m.-6:05 a.m.

Nonstop5h 15m

Philadelphia

Tue 18/8

12:02 p.m.-6:52 p.m.

1 stop9h 50m

C$ 465

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 28/5

10:35 p.m.-9:27 a.m.

1 stop7h 52m

Philadelphia

Sun 31/5

7:10 a.m.-10:00 a.m.

Nonstop5h 50m

C$ 465

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 29/8

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

1 stop9h 05m

Philadelphia

Sun 13/9

11:50 a.m.-5:00 p.m.

1 stop8h 10m

C$ 479

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 9/6

5:00 a.m.-5:00 p.m.

2 stops9h 00m

Philadelphia

Sun 30/8

6:20 a.m.-1:15 p.m.

1 stop9h 55m

C$ 486

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 19/8

9:50 p.m.-6:05 a.m.

Nonstop5h 15m

Philadelphia

Thu 27/8

7:05 a.m.-10:04 a.m.

Nonstop5h 59m

C$ 486

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 8/4

11:45 p.m.-10:35 a.m.

1 stop7h 50m

Philadelphia

Wed 29/4

5:50 a.m.-10:55 a.m.

1 stop8h 05m

C$ 524

Flights are sorted by cheapest round-trip flights first.

Deals found on 19/3

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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Philadelphia. Price data was last updated on 13 March 2026.

The best time to book flights from Seattle to Philadelphia is 81 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, December is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 177). Flying from Seattle to Philadelphia in April is currently the most expensive (average of C$ 300). 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 22 March 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.

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.

  • How popular is this Seattle to Philadelphia flight route?

    This flight path from Seattle/Tacoma Intl to Philadelphia was viewed by 5 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$ 451, Delta can have you in Philadelphia from Seattle in 5h 10m. Seattle and Philadelphia are separated by a distance of 3814 km. All flights are typically direct.

  • 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: Qatar Airways (82%), British Airways (82%), American Airlines( 81%).

  • 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$ 456, our data indicates the cheapest price to be C$ 260. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 524.

  • 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, December is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 177). Flying from Seattle to Philadelphia in April is currently the most expensive (average of C$ 300). 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
Reading
King of Prussia

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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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