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Cheap flights from Seattle to Philadelphia from C$ 230

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 20/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
7 Jul — 14 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 7 June 2026.

Thu 20/89:29 p.m.
SEA
-
PHL
Nonstop5h 11m
Delta
Thu 27/87:00 a.m.
PHL
-
SEA
Nonstop5h 56m
Delta
Deal found 2/6C$ 459
Tue 25/89:27 p.m.
SEA
-
PHL
Nonstop5h 13m
Alaska Airlines
Tue 1/96:08 p.m.
PHL
-
SEA
Nonstop5h 52m
Alaska Airlines
Deal found 6/6C$ 466
Fri 21/811:00 p.m.
SEA
-
PHL
1 stop8h 07m
United Airlines
Mon 24/811:03 a.m.
PHL
-
SEA
1 stop8h 04m
United Airlines
Deal found 7/6C$ 467
Thu 12/119:25 p.m.
SEA
-
PHL
Nonstop5h 08m
Alaska Airlines
Sun 15/114:25 p.m.
PHL
-
SEA
1 stop9h 09m
Alaska Airlines
Deal found 5/6C$ 471
Thu 20/89:29 p.m.
SEA
-
PHL
Nonstop5h 11m
Delta
Fri 28/83:58 p.m.
PHL
-
SEA
1 stop10h 59m
Delta
Deal found 2/6C$ 472
Wed 26/811:04 p.m.
SEA
-
PHL
1 stop7h 39m
United Airlines
Tue 1/910:30 a.m.
PHL
-
SEA
2 stops10h 12m
United Airlines
Deal found 6/6C$ 477
Tue 25/89:27 p.m.
SEA
-
PHL
Nonstop5h 13m
Alaska Airlines
Wed 2/94:48 p.m.
PHL
-
SEA
1 stop8h 51m
Alaska Airlines
Deal found 6/6C$ 479
Sat 4/79:25 a.m.
SEA
-
PHL
Nonstop5h 10m
Delta
Mon 13/76:55 p.m.
PHL
-
SEA
1 stop8h 04m
Delta
Deal found 5/6C$ 481
Tue 4/87:00 a.m.
SEA
-
PHL
1 stop7h 52m
United Airlines
Tue 11/81:35 p.m.
PHL
-
SEA
1 stop8h 32m
United Airlines
Deal found 5/6C$ 482
Wed 26/86:25 a.m.
SEA
-
PHL
2 stops11h 10m
Southwest
Wed 2/95:10 p.m.
PHL
-
SEA
1 stop8h 55m
Southwest
Deal found 4/6C$ 493

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 7 June 2026.

Round-trip from

C$ 459

One-way from

C$ 230

Popular in

December

Cheapest in

October

Average price

C$ 658

Good round-trip deal

C$ 457 or less

Good one-way deal

C$ 646 or less
Delta
  • Delta
  • 20/8-28/8
  • Nonstop
  • 11h 07m total
  • Seattle to Philadelphia
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Delta
  • Delta
  • 20/8
  • Nonstop
  • 5h 11m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 5 potential increase over avg. RT price).
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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
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Philadelphia.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Philadelphia.
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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 7 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

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$ 459

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 3/7

10:29 p.m.-3:23 p.m.

1 stop13h 54m

Philadelphia

Sat 4/7

4:26 p.m.-7:30 p.m.

Nonstop6h 04m

C$ 472

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 16/7

9:20 p.m.-5:29 a.m.

Nonstop5h 09m

Philadelphia

Mon 20/7

6:57 p.m.-11:58 p.m.

1 stop8h 01m

C$ 486

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

9:59 p.m.-3:25 p.m.

1 stop14h 26m

Philadelphia

Sun 15/11

4:25 p.m.-10:34 p.m.

1 stop9h 09m

C$ 486

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 3/7

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

1 stop9h 50m

Philadelphia

Sat 4/7

12:00 p.m.-8:10 p.m.

2 stops11h 10m

C$ 493

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 18/8

9:29 p.m.-5:40 a.m.

Nonstop5h 11m

Philadelphia

Thu 27/8

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

1 stop7h 59m

C$ 520

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 12/10

9:05 p.m.-11:00 a.m.

2 stops10h 55m

Philadelphia

Mon 26/10

7:50 a.m.-1:10 p.m.

1 stop8h 20m

C$ 527

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 21/8

7:50 p.m.-6:05 a.m.

1 stop7h 15m

Philadelphia

Mon 24/8

5:45 a.m.-1:00 p.m.

1 stop10h 15m

C$ 534

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 20/8

7:00 a.m.-9:05 p.m.

2 stops11h 05m

Philadelphia

Sun 23/8

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

1 stop9h 55m

C$ 541

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 21/8

7:50 p.m.-6:05 a.m.

1 stop7h 15m

Philadelphia

Sun 23/8

7:00 a.m.-9:56 a.m.

Nonstop5h 56m

C$ 567

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/6

Showing 1-10 of 20 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 85 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$ 459). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 728). 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 7 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$ 472, Delta can have you in Philadelphia from Seattle in 8h 23m. 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$ 611, our data indicates the cheapest price to be C$ 457. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 472.

  • 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$ 459). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 728). 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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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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