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Cheap flights from Seattle to Philadelphia from C$ 199

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 22/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
5 May — 12 May1
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 5 April 2026.

Fri 24/49:44 p.m.
SEA
-
PHL
Nonstop5h 18m
Alaska Airlines
Sat 9/57:22 a.m.
PHL
-
SEA
Nonstop5h 58m
Alaska Airlines
Deal found 1/4C$ 406
Fri 8/511:59 p.m.
SEA
-
PHL
1 stop7h 33m
Delta
Tue 26/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 1/4C$ 410
Wed 29/46:00 a.m.
SEA
-
PHL
1 stop6h 55m
Southwest
Wed 29/45:45 p.m.
PHL
-
SEA
1 stop9h 25m
Southwest
Deal found 31/3C$ 424
Mon 11/57:50 p.m.
SEA
-
PHL
1 stop30h 47m
Frontier
Mon 18/58:35 p.m.
PHL
-
SEA
1 stop16h 14m
Frontier
Deal found 3/4C$ 428
Wed 27/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Mon 15/67:00 a.m.
PHL
-
SEA
Nonstop5h 59m
Delta
Deal found 31/3C$ 429
Thu 30/45:15 a.m.
SEA
-
PHL
1 stop10h 10m
Southwest
Thu 7/511:10 a.m.
PHL
-
SEA
2 stops11h 55m
Southwest
Deal found 31/3C$ 439
Thu 7/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Fri 29/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 2/4C$ 442
Wed 29/47:35 p.m.
SEA
-
PHL
1 stop7h 24m
Delta
Tue 12/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 1/4C$ 443
Sat 25/411:11 p.m.
SEA
-
PHL
1 stop6h 44m
Delta
Mon 11/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 1/4C$ 448
Tue 5/59:44 p.m.
SEA
-
PHL
Nonstop5h 18m
Alaska Airlines
Wed 27/57:00 a.m.
PHL
-
SEA
Nonstop5h 59m
Alaska Airlines
Deal found 2/4C$ 450
Thu 7/55:45 p.m.
SEA
-
PHL
1 stop9h 25m
Delta
Thu 28/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 2/4C$ 456

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 5 April 2026.

Round-trip from

C$ 406

One-way from

C$ 199

Popular in

December

Cheapest in

October

Average price

C$ 574

Good round-trip deal

C$ 492 or less
Alaska Airlines
  • Alaska Airlines
  • 24/4-9/5
  • Nonstop
  • 11h 16m total
  • Seattle to Philadelphia
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 28/4
  • Nonstop
  • 5h 18m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (C$ 13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 5 April 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 11/6

9:31 p.m.-5:45 a.m.

Nonstop5h 14m

Philadelphia

Tue 16/6

7:00 a.m.-9:59 a.m.

Nonstop5h 59m

C$ 459

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 27/9

9:50 p.m.-6:05 a.m.

Nonstop5h 15m

Philadelphia

Fri 2/10

7:05 a.m.-10:04 a.m.

Nonstop5h 59m

C$ 459

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 15/5

5:45 p.m.-6:10 a.m.

1 stop9h 25m

Philadelphia

Sun 24/5

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

Nonstop5h 50m

C$ 473

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 28/5

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

Nonstop5h 17m

Philadelphia

Mon 1/6

6:45 p.m.-12:10 a.m.

1 stop8h 25m

C$ 473

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 28/4

6:50 a.m.-9:05 p.m.

2 stops11h 15m

Philadelphia

Sat 2/5

12:25 p.m.-10:00 p.m.

2 stops12h 35m

C$ 484

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 10/6

9:31 p.m.-5:45 a.m.

Nonstop5h 14m

Philadelphia

Sat 13/6

7:00 a.m.-9:59 a.m.

Nonstop5h 59m

C$ 492

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 22/8

9:50 p.m.-6:05 a.m.

Nonstop5h 15m

Philadelphia

Thu 27/8

7:05 a.m.-10:04 a.m.

Nonstop5h 59m

C$ 492

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 4/5

11:14 p.m.-11:48 a.m.

1 stop9h 34m

Philadelphia

Mon 11/5

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

Nonstop5h 50m

C$ 506

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 28/4

7:00 a.m.-5:33 p.m.

1 stop7h 33m

Philadelphia

Wed 29/4

11:36 a.m.-7:00 p.m.

1 stop10h 24m

C$ 514

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 27/5

9:20 a.m.-10:00 p.m.

2 stops9h 40m

Philadelphia

Wed 3/6

2:00 p.m.-11:55 p.m.

2 stops12h 55m

C$ 520

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/4

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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Philadelphia. Price data was last updated on 3 April 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$ 180). Flying from Seattle to Philadelphia in April is currently the most expensive (average of C$ 305). 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 5 April 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 6 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$ 459, Delta can have you in Philadelphia from Seattle in 5h 14m. 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: STARLUX Airlines (93%), Qatar Airways (91%), British Airways( 91%).

  • 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$ 728, our data indicates the cheapest price to be C$ 492. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 528.

  • 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$ 180). Flying from Seattle to Philadelphia in April is currently the most expensive (average of C$ 305). 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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