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Cheap flights from Seattle to Philadelphia from C$ 227

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 27/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
20 Jun — 27 Jun1
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 21 May 2026.

Wed 1/79:25 a.m.
SEA
-
PHL
Nonstop5h 10m
Delta
Sat 4/76:45 p.m.
PHL
-
SEA
Nonstop6h 14m
Delta
Deal found 18/5C$ 453
Sat 6/69:22 p.m.
SEA
-
PHL
Nonstop5h 13m
Alaska Airlines
Sun 7/67:00 a.m.
PHL
-
SEA
Nonstop5h 59m
Alaska Airlines
Deal found 16/5C$ 457
Tue 9/69:25 a.m.
SEA
-
PHL
Nonstop5h 10m
Delta
Sun 21/66:45 p.m.
PHL
-
SEA
Nonstop6h 14m
Delta
Deal found 18/5C$ 458
Sun 24/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Thu 28/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 17/5C$ 464
Wed 1/79:25 a.m.
SEA
-
PHL
Nonstop5h 10m
Delta
Fri 10/74:08 p.m.
PHL
-
SEA
1 stop10h 51m
Delta
Deal found 19/5C$ 466
Mon 13/79:20 p.m.
SEA
-
PHL
Nonstop5h 09m
Delta
Tue 21/75:28 p.m.
PHL
-
SEA
1 stop8h 05m
Delta
Deal found 19/5C$ 468
Fri 29/511:55 p.m.
SEA
-
PHL
1 stop12h 10m
Southwest
Sat 6/64:50 p.m.
PHL
-
SEA
1 stop10h 20m
Southwest
Deal found 16/5C$ 473
Thu 2/711:10 p.m.
SEA
-
PHL
1 stop6h 34m
Delta
Fri 10/74:08 p.m.
PHL
-
SEA
1 stop10h 51m
Delta
Deal found 19/5C$ 480

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 21 May 2026.

Round-trip from

C$ 453

One-way from

C$ 227

Popular in

December

Cheapest in

October

Average price

C$ 591
Delta
  • Delta
  • 1/7-5/7
  • Nonstop
  • 11h 24m total
  • Seattle to Philadelphia
Search Deals
Delta
  • Delta
  • 4/7
  • Nonstop
  • 5h 10m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 0 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 21 May 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

Sat 27/6

8:28 a.m.-4:43 p.m.

Nonstop5h 15m

Philadelphia

Sat 4/7

4:26 p.m.-7:30 p.m.

Nonstop6h 04m

C$ 453

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 22/10

9:50 p.m.-6:03 a.m.

Nonstop5h 13m

Philadelphia

Sun 25/10

7:05 a.m.-10:24 a.m.

Nonstop6h 19m

C$ 453

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 31/7

9:20 p.m.-5:29 a.m.

Nonstop5h 09m

Philadelphia

Thu 6/8

7:00 p.m.-11:59 p.m.

1 stop7h 59m

C$ 466

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 27/8

6:51 p.m.-3:45 p.m.

1 stop17h 54m

Philadelphia

Sat 5/9

7:02 a.m.-9:53 a.m.

Nonstop5h 51m

C$ 466

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 24/6

6:00 a.m.-5:22 p.m.

1 stop8h 22m

Philadelphia

Mon 29/6

6:45 p.m.-9:59 p.m.

Nonstop6h 14m

C$ 466

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 11/8

11:10 p.m.-8:48 a.m.

1 stop6h 38m

Philadelphia

Tue 18/8

7:00 a.m.-9:56 a.m.

Nonstop5h 56m

C$ 466

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 3/7

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

1 stop9h 37m

Philadelphia

Mon 6/7

6:45 p.m.-9:59 p.m.

Nonstop6h 14m

C$ 513

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 27/8

7:00 a.m.-9:40 p.m.

2 stops11h 40m

Philadelphia

Sat 5/9

3:45 p.m.-8:55 p.m.

1 stop8h 10m

C$ 521

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 30/6

9:25 a.m.-5:35 p.m.

Nonstop5h 10m

Philadelphia

Wed 1/7

6:45 p.m.-9:59 p.m.

Nonstop6h 14m

C$ 546
Cheapest one-way

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 27/8

9:29 p.m.-5:40 a.m.

Nonstop5h 11m

C$ 227

Flights are sorted by cheapest round-trip flights first.

Deals found on 19/5

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

The best time to book flights from Seattle to Philadelphia is 80 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, October is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 453). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 725). 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 21 May 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 10 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$ 453, Alaska Airlines can have you in Philadelphia from Seattle in 5h 13m. 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: Cathay Pacific (100%), British Airways (100%), STARLUX Airlines( 97%).

  • 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, October is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 453). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 725). 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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