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Cheap flights from Seattle to Philadelphia from C$ 225

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 19/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
29 May — 5 Jun1
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 29 April 2026.

Tue 9/69:25 a.m.
SEA
-
PHL
Nonstop5h 10m
Delta
Sun 21/66:45 p.m.
PHL
-
SEA
Nonstop6h 14m
Delta
Deal found 27/4C$ 449
Sat 23/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Tue 2/67:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 28/4C$ 455
Mon 18/510:47 p.m.
SEA
-
PHL
Nonstop5h 13m
American Airlines
Tue 9/67:35 p.m.
PHL
-
SEA
Nonstop6h 23m
American Airlines
Deal found 25/4C$ 456
Fri 22/59:22 p.m.
SEA
-
PHL
Nonstop5h 13m
Alaska Airlines
Tue 26/57:16 p.m.
PHL
-
SEA
Nonstop6h 12m
Alaska Airlines
Deal found 27/4C$ 460
Thu 28/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Mon 1/66:45 p.m.
PHL
-
SEA
1 stop8h 25m
Delta
Deal found 28/4C$ 463
Wed 20/511:59 p.m.
SEA
-
PHL
1 stop7h 31m
Delta
Tue 26/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 27/4C$ 469
Fri 22/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Sun 24/57:25 a.m.
PHL
-
SEA
1 stop10h 58m
Delta
Deal found 28/4C$ 474
Thu 4/612:20 p.m.
SEA
-
PHL
1 stop9h 25m
Southwest
Mon 22/65:20 p.m.
PHL
-
SEA
1 stop10h 10m
Southwest
Deal found 28/4C$ 477
Thu 4/611:10 a.m.
SEA
-
PHL
2 stops10h 35m
Southwest
Sat 6/62:50 p.m.
PHL
-
SEA
1 stop7h 20m
Southwest
Deal found 28/4C$ 478

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 29 April 2026.

Round-trip from

C$ 449

One-way from

C$ 225

Popular in

December

Cheapest in

October

Average price

C$ 611

Good one-way deal

C$ 225 or less
Delta
  • Delta
  • 9/6-21/6
  • Nonstop
  • 11h 24m total
  • Seattle to Philadelphia
Search Deals
Delta
  • Delta
  • 7/6
  • Nonstop
  • 5h 10m 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$ 22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
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 29 April 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
Quickest round-trip

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 24/5

9:20 p.m.-5:37 a.m.

Nonstop5h 17m

Philadelphia

Sat 30/5

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

Nonstop5h 50m

C$ 449

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 4/6

9:22 p.m.-5:35 a.m.

Nonstop5h 13m

Philadelphia

Wed 10/6

7:33 a.m.-10:32 a.m.

Nonstop5h 59m

C$ 449

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 26/6

9:25 a.m.-5:35 p.m.

Nonstop5h 10m

Philadelphia

Sun 28/6

6:45 p.m.-9:59 p.m.

Nonstop6h 14m

C$ 449

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 22/10

9:50 p.m.-6:03 a.m.

Nonstop5h 13m

Philadelphia

Sun 25/10

7:05 a.m.-10:24 a.m.

Nonstop6h 19m

C$ 449

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 14/7

5:20 a.m.-4:43 p.m.

1 stop8h 23m

Philadelphia

Thu 13/8

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

Nonstop5h 59m

C$ 463

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 12/6

5:30 a.m.-4:36 p.m.

1 stop8h 06m

Philadelphia

Fri 19/6

6:45 p.m.-9:59 p.m.

Nonstop6h 14m

C$ 463

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 9/7

7:20 a.m.-9:20 p.m.

1 stop11h 00m

Philadelphia

Wed 15/7

7:05 a.m.-10:01 a.m.

Nonstop5h 56m

C$ 463

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/8

9:30 p.m.-5:53 a.m.

Nonstop5h 23m

Philadelphia

Thu 13/8

6:40 p.m.-12:01 a.m.

1 stop8h 21m

C$ 463

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/6

5:30 a.m.-6:20 p.m.

1 stop9h 50m

Philadelphia

Tue 9/6

5:40 p.m.-11:30 p.m.

1 stop8h 50m

C$ 477

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 14/7

5:15 a.m.-6:00 p.m.

1 stop9h 45m

Philadelphia

Thu 13/8

4:05 p.m.-8:45 p.m.

1 stop7h 40m

C$ 477

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/4

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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$ 447). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 740). 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 29 April 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?

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 6 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$ 449, Delta can have you in Philadelphia from Seattle in 5h 13m. 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: Cathay Pacific (100%), British Airways (100%), Air Tahiti Nui( 93%).

  • 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$ 240, our data indicates the cheapest price to be C$ 224. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 484.

  • 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$ 447). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 740). 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?

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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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