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Cheap flights from Seattle to Philadelphia from C$ 163

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 18/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
30 Mar — 6 Apr1
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 28 February 2026.

Wed 29/411:14 p.m.
SEA
-
PHL
1 stop6h 41m
Delta
Fri 8/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 25/2C$ 351
Sun 10/54:20 p.m.
SEA
-
PHL
1 stop10h 14m
Frontier
Mon 18/58:25 p.m.
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 24/2C$ 356
Mon 11/54:20 p.m.
SEA
-
PHL
1 stop10h 14m
Frontier
Mon 18/58:25 p.m.
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 24/2C$ 363
Fri 27/34:55 p.m.
SEA
-
PHL
1 stop9h 46m
Delta
Tue 31/36:49 p.m.
PHL
-
SEA
1 stop8h 14m
Delta
Deal found 25/2C$ 365
Sun 10/54:20 p.m.
SEA
-
PHL
1 stop10h 14m
Frontier
Sun 17/55:05 a.m.
PHL
-
SEA
2 stops15h 37m
Frontier
Deal found 24/2C$ 366
Sat 12/99:15 p.m.
SEA
-
PHL
Nonstop5h 12m
Alaska Airlines
Sat 19/96:45 a.m.
PHL
-
SEA
Nonstop6h 01m
Alaska Airlines
Deal found 27/2C$ 367
Sat 9/56:57 p.m.
SEA
-
PHL
2 stops19h 37m
Frontier
Mon 18/58:25 p.m.
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 24/2C$ 369
Fri 22/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Sun 24/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 24/2C$ 378
Sat 12/911:53 p.m.
SEA
-
PHL
1 stop7h 40m
Delta
Sun 20/97:05 a.m.
PHL
-
SEA
Nonstop5h 59m
Delta
Deal found 27/2C$ 381
Thu 28/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Sat 6/65:18 p.m.
PHL
-
SEA
1 stop8h 28m
Delta
Deal found 26/2C$ 386
Wed 1/411:55 p.m.
SEA
-
PHL
1 stop8h 05m
Southwest
Tue 7/45:45 p.m.
PHL
-
SEA
1 stop9h 25m
Southwest
Deal found 25/2C$ 388
Fri 22/57:59 p.m.
SEA
-
PHL
1 stop7h 11m
Delta
Mon 25/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 25/2C$ 392

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 28 February 2026.

Round-trip from

C$ 351

One-way from

C$ 163

Popular in

February

Cheapest in

January

Average price

C$ 774

Good round-trip deal

C$ 648 or less
Delta
  • Delta
  • 29/4-8/5
  • 1 total stop
  • 12h 31m total
  • Seattle to Philadelphia
Search Deals
United Airlines
  • United Airlines
  • 8/4
  • 1 total stop
  • 9h 18m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 1 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
Price to beat on a round-trip 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 28 February 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

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 28/5

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

Nonstop5h 17m

Philadelphia

Sat 6/6

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

Nonstop5h 50m

C$ 378

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 22/5

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

Nonstop5h 17m

Philadelphia

Sun 24/5

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

Nonstop5h 50m

C$ 378

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 23/3

4:55 p.m.-5:41 a.m.

1 stop9h 46m

Philadelphia

Tue 31/3

6:49 p.m.-12:03 a.m.

1 stop8h 14m

C$ 406

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 1/5

9:00 p.m.-10:35 a.m.

2 stops10h 35m

Philadelphia

Mon 4/5

2:15 p.m.-11:30 p.m.

2 stops12h 15m

C$ 430

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 29/7

11:05 p.m.-11:55 a.m.

1 stop9h 50m

Philadelphia

Wed 5/8

6:00 a.m.-1:20 p.m.

1 stop10h 20m

C$ 449

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 24/4

9:00 p.m.-10:35 a.m.

2 stops10h 35m

Philadelphia

Mon 27/4

2:15 p.m.-11:30 p.m.

2 stops12h 15m

C$ 451

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 17/4

9:00 p.m.-10:35 a.m.

2 stops10h 35m

Philadelphia

Wed 22/4

7:30 a.m.-4:55 p.m.

2 stops12h 25m

C$ 458

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 11/5

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

Nonstop5h 17m

Philadelphia

Sun 17/5

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

Nonstop5h 50m

C$ 474

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 9/5

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

Nonstop5h 17m

Philadelphia

Sun 17/5

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

Nonstop5h 50m

C$ 474

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 10/5

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

Nonstop5h 17m

Philadelphia

Sun 17/5

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

Nonstop5h 50m

C$ 474

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/2

Showing 1-10 of 22 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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Philadelphia. Price data was last updated on 20 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$ 272). 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 28 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$ 367, Delta can have you in Philadelphia from Seattle in 5h 15m. 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: American Airlines (86%), Qatar Airways (86%), British Airways( 86%).

  • 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$ 759, our data indicates the cheapest price to be C$ 394. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 595.

  • 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$ 272). 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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