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Cheap flights from Seattle to Philadelphia from C$ 168

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 18/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
13 Mar — 20 Mar1
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 11 February 2026.

Mon 30/39:55 p.m.
SEA
-
PHL
Nonstop5h 10m
Alaska Airlines
Mon 6/46:47 p.m.
PHL
-
SEA
Nonstop6h 05m
Alaska Airlines
Deal found 9/2C$ 375
Fri 15/59:27 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Sun 24/56:10 a.m.
PHL
-
SEA
1 stop7h 15m
Delta
Deal found 8/2C$ 389
Wed 4/39:19 a.m.
SEA
-
PHL
1 stop9h 14m
United Airlines
Wed 11/36:20 p.m.
PHL
-
SEA
1 stop9h 39m
United Airlines
Deal found 8/2C$ 396
Sat 25/411:55 p.m.
SEA
-
PHL
1 stop7h 45m
Southwest
Wed 29/42:00 p.m.
PHL
-
SEA
2 stops11h 30m
Southwest
Deal found 8/2C$ 398
Thu 26/311:59 p.m.
SEA
-
PHL
1 stop7h 46m
Delta
Mon 30/36:49 p.m.
PHL
-
SEA
1 stop8h 14m
Delta
Deal found 8/2C$ 403
Sat 18/41:00 p.m.
SEA
-
PHL
1 stop7h 00m
Southwest
Mon 20/42:15 p.m.
PHL
-
SEA
2 stops12h 15m
Southwest
Deal found 8/2C$ 404
Sat 28/35:00 a.m.
SEA
-
PHL
1 stop9h 30m
Southwest
Tue 31/36:05 p.m.
PHL
-
SEA
1 stop8h 50m
Southwest
Deal found 8/2C$ 407
Tue 10/312:55 p.m.
SEA
-
PHL
1 stop7h 37m
United Airlines
Tue 17/310:35 a.m.
PHL
-
SEA
2 stops11h 28m
United Airlines
Deal found 9/2C$ 409
Fri 27/37:35 p.m.
SEA
-
PHL
1 stop7h 06m
Delta
Tue 31/36:49 p.m.
PHL
-
SEA
1 stop8h 14m
Delta
Deal found 9/2C$ 416
Sun 1/37:25 a.m.
SEA
-
PHL
1 stop7h 40m
Southwest
Sat 7/37:05 p.m.
PHL
-
SEA
1 stop8h 10m
Southwest
Deal found 8/2C$ 417

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 11 February 2026.

Round-trip from

C$ 375

One-way from

C$ 168

Popular in

February

Cheapest in

January

Average price

C$ 755
Alaska Airlines
  • Alaska Airlines
  • 30/3-6/4
  • Nonstop
  • 11h 15m total
  • Seattle to Philadelphia
Search Deals
Southwest
  • Southwest
  • 18/4
  • 1 total stop
  • 7h 00m total
  • Seattle to Philadelphia
Search Deals
High demand for flights, 0% potential price rise
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 February 2026
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 11 February 2026.
Use the filters below to find and compare flights from Seattle to Philadelphia that are best for you.

Fly from

Seattle

Fly to

Philadelphia

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 24/3

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

Nonstop5h 10m

Philadelphia

Tue 31/3

7:25 a.m.-10:30 a.m.

Nonstop6h 05m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 28/5

9:27 p.m.-5:44 a.m.

Nonstop5h 17m

Philadelphia

Sat 6/6

6:59 a.m.-9:48 a.m.

Nonstop5h 49m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 22/5

9:27 p.m.-5:44 a.m.

Nonstop5h 17m

Philadelphia

Sun 24/5

6:59 a.m.-9:50 a.m.

Nonstop5h 51m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 21/5

9:27 p.m.-5:44 a.m.

Nonstop5h 17m

Philadelphia

Mon 25/5

7:01 p.m.-11:41 p.m.

1 stop7h 40m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 15/5

9:27 p.m.-5:44 a.m.

Nonstop5h 17m

Philadelphia

Sun 17/5

6:59 a.m.-9:50 a.m.

Nonstop5h 51m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 3/6

9:27 p.m.-5:42 a.m.

Nonstop5h 15m

Philadelphia

Sat 6/6

6:59 a.m.-9:48 a.m.

Nonstop5h 49m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 20/5

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

1 stop7h 52m

Philadelphia

Sun 24/5

6:59 a.m.-9:50 a.m.

Nonstop5h 51m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 9/5

9:27 p.m.-5:44 a.m.

Nonstop5h 17m

C$ 188

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 7/3

2:45 p.m.-12:20 a.m.

1 stop6h 35m

C$ 190

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 12/5

9:27 p.m.-5:44 a.m.

Nonstop5h 17m

C$ 195

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/2

Showing 1-10 of 18 results
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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 6 February 2026.

The best time to book flights from Seattle to Philadelphia is 59 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$ 175). Flying from Seattle to Philadelphia in February is currently the most expensive (average of C$ 268). 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 11 February 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$ 375, Alaska Airlines 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 (84%), British Airways (84%), American Airlines( 82%).

  • 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$ 175). Flying from Seattle to Philadelphia in February is currently the most expensive (average of C$ 268). 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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