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Cheap flights from Seattle to Philadelphia from C$ 189

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 16/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
19 Mar — 26 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 17 February 2026.

Thu 9/412:42 p.m.
SEA
-
PHL
1 stop13h 49m
Frontier
Sun 19/48:25 p.m.
PHL
-
SEA
1 stop21h 40m
Frontier
Deal found 13/2C$ 331
Wed 22/46:57 p.m.
SEA
-
PHL
1 stop7h 37m
Frontier
Mon 27/46:43 a.m.
PHL
-
SEA
1 stop16h 37m
Frontier
Deal found 15/2C$ 361
Wed 22/49:44 p.m.
SEA
-
PHL
Nonstop5h 18m
Alaska Airlines
Mon 27/46:58 p.m.
PHL
-
SEA
Nonstop6h 04m
Alaska Airlines
Deal found 15/2C$ 362
Fri 22/59:27 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Sun 24/56:59 a.m.
PHL
-
SEA
Nonstop5h 51m
Delta
Deal found 15/2C$ 377
Fri 24/44:20 p.m.
SEA
-
PHL
1 stop10h 14m
Multiple Airlines
Mon 27/46:58 p.m.
PHL
-
SEA
Nonstop6h 04m
Multiple Airlines
Deal found 16/2C$ 381
Thu 28/511:59 p.m.
SEA
-
PHL
1 stop7h 34m
Delta
Sat 6/66:59 a.m.
PHL
-
SEA
Nonstop5h 49m
Delta
Deal found 16/2C$ 391
Thu 21/59:27 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Tue 26/56:59 a.m.
PHL
-
SEA
Nonstop5h 51m
Delta
Deal found 16/2C$ 405
Tue 31/311:55 p.m.
SEA
-
PHL
1 stop7h 40m
Southwest
Tue 7/42:00 p.m.
PHL
-
SEA
2 stops11h 30m
Southwest
Deal found 14/2C$ 411
Wed 3/69:27 p.m.
SEA
-
PHL
Nonstop5h 15m
Delta
Sun 7/67:05 a.m.
PHL
-
SEA
Nonstop5h 59m
Delta
Deal found 15/2C$ 425
Wed 11/311:59 p.m.
SEA
-
PHL
1 stop7h 15m
United Airlines
Sat 14/36:20 p.m.
PHL
-
SEA
1 stop9h 39m
United Airlines
Deal found 16/2C$ 428
Sat 23/510:40 p.m.
SEA
-
PHL
1 stop8h 50m
United Airlines
Mon 1/66:45 p.m.
PHL
-
SEA
1 stop8h 14m
United Airlines
Deal found 17/2C$ 429

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 17 February 2026.

Round-trip from

C$ 331

One-way from

C$ 189

Popular in

February

Cheapest in

January

Average price

C$ 772
Frontier
  • Frontier
  • 9/4-19/4
  • 2 total stops
  • 35h 29m total
  • Seattle to Philadelphia
Search Deals
Delta
  • Delta
  • 12/5
  • Nonstop
  • 5h 17m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 3 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 24 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 17 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 19/5

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

Nonstop5h 17m

Philadelphia

Tue 2/6

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

Nonstop5h 49m

C$ 377

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$ 377

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 8/5

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

Nonstop5h 17m

Philadelphia

Sun 10/5

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

Nonstop5h 51m

C$ 377

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$ 377

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 20/5

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

Nonstop5h 17m

Philadelphia

Wed 27/5

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

Nonstop5h 51m

C$ 377

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 29/4

7:35 p.m.-5:35 a.m.

1 stop7h 00m

Philadelphia

Fri 8/5

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

Nonstop5h 51m

C$ 391

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 23/5

5:30 a.m.-5:09 p.m.

1 stop8h 39m

Philadelphia

Sun 24/5

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

Nonstop5h 51m

C$ 391

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 18/5

11:48 p.m.-10:29 a.m.

1 stop7h 41m

Philadelphia

Sat 23/5

6:23 p.m.-1:13 a.m.

1 stop9h 50m

C$ 405

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 16/5

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

Nonstop5h 17m

C$ 189

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 12/5

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

Nonstop5h 17m

C$ 189

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/2

Showing 1-10 of 17 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 13 February 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$ 176). Flying from Seattle to Philadelphia in February is currently the most expensive (average of C$ 271). 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 17 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$ 377, Delta can have you in Philadelphia from Seattle in 5h 17m. 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: American Airlines (86%), Qatar Airways (86%), British Airways( 86%).

  • 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$ 176). Flying from Seattle to Philadelphia in February is currently the most expensive (average of C$ 271). 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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