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Cheap flights from Seattle to Philadelphia from C$ 228

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 26/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
12 May — 19 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 12 April 2026.

Fri 15/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Sun 24/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 10/4C$ 455
Tue 14/710:35 p.m.
SEA
-
PHL
Nonstop5h 13m
American Airlines
Tue 28/77:35 p.m.
PHL
-
SEA
Nonstop6h 21m
American Airlines
Deal found 9/4C$ 458
Thu 7/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Sun 10/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 10/4C$ 461
Thu 28/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Mon 1/67:25 a.m.
PHL
-
SEA
1 stop10h 56m
Delta
Deal found 10/4C$ 469
Wed 15/711:05 p.m.
SEA
-
PHL
1 stop9h 50m
Southwest
Tue 21/74:35 p.m.
PHL
-
SEA
1 stop10h 45m
Southwest
Deal found 9/4C$ 483
Thu 4/611:10 a.m.
SEA
-
PHL
2 stops10h 30m
Southwest
Mon 8/66:55 p.m.
PHL
-
SEA
1 stop8h 30m
Southwest
Deal found 8/4C$ 490
Thu 4/69:20 p.m.
SEA
-
PHL
Nonstop5h 15m
Delta
Mon 8/66:57 p.m.
PHL
-
SEA
1 stop8h 02m
Delta
Deal found 7/4C$ 497

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 12 April 2026.

Round-trip from

C$ 455

One-way from

C$ 228

Popular in

December

Cheapest in

October

Average price

C$ 619

Good round-trip deal

C$ 488 or less

Good one-way deal

C$ 316 or less
Alaska Airlines
  • Alaska Airlines
  • 4/9-23/9
  • Nonstop
  • 11h 10m total
  • Seattle to Philadelphia
Search Deals
Delta
  • Delta
  • 6/10
  • Nonstop
  • 5h 13m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (C$ 7 potential increase over avg. RT price).
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 April 2026
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Philadelphia.
Search Deals
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 12 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

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 15/5

9:22 p.m.-5:35 a.m.

Nonstop5h 13m

Philadelphia

Sun 24/5

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

Nonstop5h 59m

C$ 455
Quickest round-trip

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$ 455

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 1/10

9:24 p.m.-5:40 a.m.

Nonstop5h 16m

Philadelphia

Tue 6/10

7:00 a.m.-10:01 a.m.

Nonstop6h 01m

C$ 455

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 15/7

9:30 p.m.-5:53 a.m.

Nonstop5h 23m

Philadelphia

Sun 26/7

7:08 a.m.-10:04 a.m.

Nonstop5h 56m

C$ 455

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 15/7

9:45 p.m.-8:41 a.m.

1 stop7h 56m

Philadelphia

Wed 29/7

7:08 a.m.-10:04 a.m.

Nonstop5h 56m

C$ 469

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 15/7

9:45 p.m.-8:41 a.m.

1 stop7h 56m

Philadelphia

Tue 21/7

7:08 a.m.-10:04 a.m.

Nonstop5h 56m

C$ 469

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 15/6

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

Nonstop5h 14m

Philadelphia

Fri 19/6

7:03 p.m.-11:59 p.m.

1 stop7h 56m

C$ 469

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 6/5

6:00 a.m.-4:37 p.m.

1 stop7h 37m

Philadelphia

Wed 13/5

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

Nonstop5h 50m

C$ 475

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 1/10

5:00 a.m.-3:50 p.m.

1 stop7h 50m

Philadelphia

Tue 6/10

6:30 p.m.-11:05 p.m.

1 stop7h 35m

C$ 483

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 15/7

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

1 stop9h 50m

Philadelphia

Tue 21/7

4:35 p.m.-12:20 a.m.

1 stop10h 45m

C$ 483

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/4

Showing 1-10 of 23 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 9 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$ 179). Flying from Seattle to Philadelphia in April is currently the most expensive (average of C$ 303). 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 12 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$ 455, Alaska Airlines can have you in Philadelphia from Seattle in 5h 16m. 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$ 519, our data indicates the cheapest price to be C$ 228. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 448.

  • 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$ 179). Flying from Seattle to Philadelphia in April is currently the most expensive (average of C$ 303). 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?

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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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