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Cheap flights from Seattle to Philadelphia from C$ 193

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 16/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
18 May — 25 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 18 April 2026.

Fri 22/59:22 p.m.
SEA
-
PHL
Nonstop5h 13m
Alaska Airlines
Fri 29/57:00 a.m.
PHL
-
SEA
Nonstop5h 59m
Alaska Airlines
Deal found 16/4C$ 450
Wed 13/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Sat 30/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 17/4C$ 456
Thu 7/59:20 p.m.
SEA
-
PHL
Nonstop5h 17m
Delta
Sun 10/57:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 13/4C$ 461
Thu 28/55:45 p.m.
SEA
-
PHL
1 stop9h 25m
Delta
Sat 6/67:10 a.m.
PHL
-
SEA
Nonstop5h 50m
Delta
Deal found 13/4C$ 464
Wed 15/79:30 p.m.
SEA
-
PHL
Nonstop5h 23m
Delta
Tue 21/77:08 a.m.
PHL
-
SEA
Nonstop5h 56m
Delta
Deal found 15/4C$ 477
Fri 15/51:30 p.m.
SEA
-
PHL
1 stop8h 27m
Delta
Sun 24/58:05 a.m.
PHL
-
SEA
1 stop10h 42m
Delta
Deal found 13/4C$ 479
Sat 16/56:00 a.m.
SEA
-
PHL
1 stop7h 40m
Delta
Fri 29/55:18 p.m.
PHL
-
SEA
1 stop8h 30m
Delta
Deal found 17/4C$ 483
Wed 15/75:00 a.m.
SEA
-
PHL
2 stops9h 00m
Southwest
Tue 21/74:35 p.m.
PHL
-
SEA
1 stop10h 45m
Southwest
Deal found 13/4C$ 484
Fri 8/511:59 p.m.
SEA
-
PHL
1 stop7h 33m
Delta
Tue 12/53:44 p.m.
PHL
-
SEA
1 stop7h 59m
Delta
Deal found 17/4C$ 488
Wed 15/79:30 p.m.
SEA
-
PHL
Nonstop5h 23m
Delta
Thu 23/75:09 p.m.
PHL
-
SEA
1 stop9h 50m
Delta
Deal found 15/4C$ 491

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 18 April 2026.

Round-trip from

C$ 450

One-way from

C$ 193

Popular in

December

Cheapest in

October

Average price

C$ 612

Good round-trip deal

C$ 482 or less

Good one-way deal

C$ 312 or less
Alaska Airlines
  • Alaska Airlines
  • 22/5-29/5
  • Nonstop
  • 11h 12m total
  • Seattle to Philadelphia
Search Deals
Frontier
  • Frontier
  • 16/5
  • 2 total stops
  • 18h 46m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 6 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 21 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
Price to beat on a one-way 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 18 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 7/5

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

Nonstop5h 17m

Philadelphia

Tue 12/5

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

Nonstop5h 50m

C$ 461

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 11/8

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

Nonstop5h 15m

Philadelphia

Tue 18/8

6:40 p.m.-12:01 a.m.

1 stop8h 21m

C$ 464

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 3/9

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

Nonstop5h 15m

Philadelphia

Mon 7/9

6:40 p.m.-12:01 a.m.

1 stop8h 21m

C$ 464

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 15/5

7:59 p.m.-6:10 a.m.

1 stop7h 11m

Philadelphia

Sun 24/5

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

Nonstop5h 50m

C$ 464

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 20/5

12:30 p.m.-11:07 p.m.

1 stop7h 37m

Philadelphia

Tue 26/5

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

Nonstop5h 50m

C$ 464

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 28/5

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

Nonstop5h 17m

Philadelphia

Sun 31/5

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

Nonstop5h 50m

C$ 497

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 28/5

5:30 a.m.-6:25 p.m.

2 stops9h 55m

Philadelphia

Tue 2/6

5:50 a.m.-1:35 p.m.

2 stops10h 45m

C$ 510

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 19/8

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

Nonstop5h 15m

Philadelphia

Sun 23/8

6:40 p.m.-12:01 a.m.

1 stop8h 21m

C$ 510

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 9/7

11:10 a.m.-12:40 a.m.

2 stops10h 30m

Philadelphia

Tue 4/8

6:25 p.m.-11:35 p.m.

1 stop8h 10m

C$ 512

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 8/5

10:55 a.m.-12:35 a.m.

2 stops10h 40m

Philadelphia

Thu 14/5

2:15 p.m.-12:05 a.m.

1 stop12h 50m

C$ 517

Flights are sorted by cheapest round-trip flights first.

Deals found on 13/4

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 10 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, October is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 447). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 742). 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 18 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$ 461, Delta can have you in Philadelphia from Seattle in 5h 17m. 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%), Air Tahiti Nui( 93%).

  • 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$ 513, our data indicates the cheapest price to be C$ 225. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 624.

  • 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$ 447). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 742). 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 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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