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Cheap flights from Seattle to Philadelphia from C$ 231

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 27/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
13 Jul — 20 Jul1
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 13 June 2026.

Thu 10/99:50 p.m.
SEA
-
PHL
Nonstop5h 15m
Delta
Sun 13/97:05 a.m.
PHL
-
SEA
Nonstop5h 59m
Delta
Deal found 8/6C$ 460
Thu 6/88:20 p.m.
SEA
-
PHL
2 stops11h 50m
Southwest
Tue 11/82:45 p.m.
PHL
-
SEA
2 stops11h 20m
Southwest
Deal found 8/6C$ 461
Sat 25/78:13 p.m.
SEA
-
PHL
1 stop30h 47m
Frontier
Sun 2/88:37 p.m.
PHL
-
SEA
1 stop15h 40m
Frontier
Deal found 12/6C$ 464
Wed 22/710:02 p.m.
SEA
-
PHL
Nonstop5h 11m
Alaska Airlines
Mon 3/87:33 a.m.
PHL
-
SEA
Nonstop5h 59m
Alaska Airlines
Deal found 10/6C$ 467
Mon 14/911:00 p.m.
SEA
-
PHL
1 stop8h 02m
United Airlines
Thu 17/91:35 p.m.
PHL
-
SEA
1 stop8h 40m
United Airlines
Deal found 13/6C$ 468
Tue 15/99:27 p.m.
SEA
-
PHL
Nonstop5h 13m
Multiple Airlines
Tue 22/93:25 p.m.
PHL
-
SEA
1 stop10h 13m
Multiple Airlines
Deal found 11/6C$ 470
Tue 18/811:00 p.m.
SEA
-
PHL
1 stop13h 45m
Alaska Airlines
Tue 25/86:59 p.m.
PHL
-
SEA
Nonstop5h 52m
Alaska Airlines
Deal found 9/6C$ 474
Thu 6/811:05 p.m.
SEA
-
PHL
1 stop10h 20m
Southwest
Mon 10/86:05 p.m.
PHL
-
SEA
1 stop8h 25m
Southwest
Deal found 8/6C$ 475
Sat 4/77:00 a.m.
SEA
-
PHL
1 stop7h 53m
United Airlines
Sat 18/76:23 p.m.
PHL
-
SEA
1 stop9h 50m
United Airlines
Deal found 10/6C$ 477
Tue 11/87:00 a.m.
SEA
-
PHL
1 stop7h 54m
United Airlines
Tue 18/810:34 a.m.
PHL
-
SEA
1 stop8h 33m
United Airlines
Deal found 13/6C$ 478
Wed 19/87:35 p.m.
SEA
-
PHL
1 stop9h 14m
United Airlines
Fri 28/86:25 a.m.
PHL
-
SEA
1 stop8h 07m
United Airlines
Deal found 8/6C$ 481
Thu 13/87:00 a.m.
SEA
-
PHL
2 stops11h 05m
Southwest
Mon 17/85:25 a.m.
PHL
-
SEA
2 stops10h 25m
Southwest
Deal found 10/6C$ 482

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 13 June 2026.

Round-trip from

C$ 460

One-way from

C$ 231

Popular in

December

Cheapest in

October

Average price

C$ 646

Good round-trip deal

C$ 459 or less

Good one-way deal

C$ 648 or less
Delta
  • Delta
  • 20/8-28/8
  • Nonstop
  • 11h 16m total
  • Seattle to Philadelphia
Search Deals
Delta
  • Delta
  • 4/7
  • Nonstop
  • 5h 10m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (C$ 14 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 June 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 13 June 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 27/9

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

Nonstop5h 20m

Philadelphia

Fri 2/10

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

Nonstop5h 51m

C$ 460

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 18/8

11:00 p.m.-3:45 p.m.

1 stop13h 45m

Philadelphia

Tue 25/8

6:59 p.m.-9:51 p.m.

Nonstop5h 52m

C$ 474

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 12/8

9:45 p.m.-9:38 a.m.

1 stop8h 53m

Philadelphia

Sun 20/9

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

Nonstop5h 51m

C$ 474

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 25/8

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

Nonstop5h 20m

Philadelphia

Thu 27/8

7:20 a.m.-2:50 p.m.

1 stop10h 30m

C$ 474

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 2/10

12:15 a.m.-11:35 a.m.

1 stop8h 20m

Philadelphia

Tue 6/10

1:40 p.m.-10:20 p.m.

2 stops11h 40m

C$ 477

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 29/7

11:05 p.m.-10:35 a.m.

1 stop8h 30m

Philadelphia

Mon 17/8

6:20 a.m.-10:45 a.m.

1 stop7h 25m

C$ 488

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 7/8

5:45 a.m.-5:47 p.m.

1 stop9h 02m

Philadelphia

Mon 10/8

7:00 p.m.-11:59 p.m.

1 stop7h 59m

C$ 488

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 21/8

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

Nonstop5h 20m

Philadelphia

Thu 27/8

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

Nonstop5h 56m

C$ 493

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 15/9

6:40 a.m.-6:00 p.m.

2 stops8h 20m

Philadelphia

Tue 22/9

3:00 p.m.-11:05 p.m.

2 stops11h 05m

C$ 502

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 15/7

11:05 p.m.-10:35 a.m.

1 stop8h 30m

Philadelphia

Wed 22/7

4:35 p.m.-12:45 a.m.

2 stops11h 10m

C$ 509

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 19 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 58 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$ 457). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 730). 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 13 June 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 11 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$ 460, Delta 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 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: Hawaiian Airlines (98%), STARLUX Airlines (95%), Cathay Pacific( 92%).

  • 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$ 613, our data indicates the cheapest price to be C$ 234. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 464.

  • 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$ 457). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 730). 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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