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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 27/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
1 Jul — 8 Jul1
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 1 June 2026.

Mon 24/89:29 p.m.
SEA
-
PHL
Nonstop5h 11m
Delta
Sat 5/97:00 a.m.
PHL
-
SEA
Nonstop5h 56m
Delta
Deal found 29/5C$ 454
Thu 16/711:10 a.m.
SEA
-
PHL
2 stops10h 35m
Southwest
Tue 11/83:00 p.m.
PHL
-
SEA
2 stops11h 05m
Southwest
Deal found 29/5C$ 455
Fri 4/911:05 p.m.
SEA
-
PHL
1 stop9h 10m
Southwest
Sat 12/92:10 p.m.
PHL
-
SEA
1 stop10h 20m
Southwest
Deal found 29/5C$ 459
Thu 3/95:15 a.m.
SEA
-
PHL
1 stop9h 40m
Southwest
Sun 6/96:10 a.m.
PHL
-
SEA
1 stop9h 50m
Southwest
Deal found 29/5C$ 461
Thu 24/910:45 a.m.
SEA
-
PHL
1 stop7h 20m
Southwest
Sun 27/95:00 a.m.
PHL
-
SEA
1 stop8h 40m
Southwest
Deal found 29/5C$ 463
Wed 19/812:05 p.m.
SEA
-
PHL
1 stop8h 51m
Delta
Sun 23/87:00 a.m.
PHL
-
SEA
Nonstop5h 56m
Delta
Deal found 28/5C$ 468
Thu 13/85:15 a.m.
SEA
-
PHL
1 stop7h 45m
Southwest
Sun 16/84:35 p.m.
PHL
-
SEA
1 stop8h 10m
Southwest
Deal found 29/5C$ 477
Thu 20/85:10 a.m.
SEA
-
PHL
1 stop8h 23m
Delta
Thu 27/86:05 a.m.
PHL
-
SEA
1 stop7h 26m
Delta
Deal found 28/5C$ 481
Sat 17/109:25 p.m.
SEA
-
PHL
Nonstop5h 15m
Alaska Airlines
Wed 21/106:39 p.m.
PHL
-
SEA
Nonstop6h 02m
Alaska Airlines
Deal found 27/5C$ 487

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 1 June 2026.

Round-trip from

C$ 454

One-way from

C$ 228

Popular in

December

Cheapest in

October

Average price

C$ 651

Good round-trip deal

C$ 452 or less

Good one-way deal

C$ 639 or less
Delta
  • Delta
  • 19/8-25/8
  • Nonstop
  • 11h 07m total
  • Seattle to Philadelphia
Search Deals
Delta
  • Delta
  • 6/8
  • Nonstop
  • 5h 11m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 4 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 June 2026
Search Deals
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 1 June 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

Sat 3/10

9:25 p.m.-5:40 a.m.

Nonstop5h 15m

Philadelphia

Tue 6/10

7:00 a.m.-9:55 a.m.

Nonstop5h 55m

C$ 454
Quickest round-trip

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 13/7

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

Nonstop5h 09m

Philadelphia

Wed 15/7

7:05 a.m.-10:01 a.m.

Nonstop5h 56m

C$ 454

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

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

Nonstop5h 13m

Philadelphia

Sun 15/11

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

Nonstop6h 19m

C$ 454

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 25/9

9:30 p.m.-5:50 a.m.

Nonstop5h 20m

Philadelphia

Mon 28/9

7:05 a.m.-9:56 a.m.

Nonstop5h 51m

C$ 454

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 16/7

11:10 a.m.-12:45 a.m.

2 stops10h 35m

Philadelphia

Tue 11/8

3:00 p.m.-11:05 p.m.

2 stops11h 05m

C$ 455

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

9:59 p.m.-3:25 p.m.

1 stop14h 26m

Philadelphia

Sun 15/11

7:00 a.m.-10:08 a.m.

Nonstop6h 08m

C$ 468

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 21/7

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

Nonstop5h 09m

Philadelphia

Mon 3/8

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

1 stop7h 59m

C$ 468

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 24/7

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

Nonstop5h 09m

Philadelphia

Tue 28/7

5:28 p.m.-10:33 p.m.

1 stop8h 05m

C$ 468

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 14/7

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

Nonstop5h 09m

Philadelphia

Wed 22/7

5:15 a.m.-11:12 a.m.

1 stop8h 57m

C$ 468

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 19/8

9:53 a.m.-7:25 p.m.

1 stop6h 32m

Philadelphia

Sun 23/8

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

Nonstop5h 56m

C$ 468

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/5

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?

The best time to book flights from Seattle to Philadelphia is 85 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$ 454). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 720). 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 1 June 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 11 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$ 454, Delta can have you in Philadelphia from Seattle in 5h 09m. 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: Cathay Pacific (100%), British Airways (100%), STARLUX Airlines( 97%).

  • 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$ 605, our data indicates the cheapest price to be C$ 452. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 454.

  • 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$ 454). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 720). 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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