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Cheap flights from Seattle to Philadelphia from C$ 240

SEA — PHL
15 Oct — 22 Oct1
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

Sat 10/1011:14 p.m. -
1 stop7h 18m
Tue 13/105:08 p.m. -
1 stop8h 48m
Deal found 10/9C$ 496
Tue 13/1012:10 a.m. -
1 stop7h 30m
Wed 21/101:50 p.m. -
2 stops11h 50m
Deal found 10/9C$ 503
Sun 1/115:30 a.m. -
1 stop8h 10m
Mon 9/116:25 p.m. -
1 stop9h 20m
Deal found 14/9C$ 506
Thu 12/1111:10 a.m. -
2 stops9h 55m
Mon 16/117:30 a.m. -
2 stops11h 30m
Deal found 10/9C$ 510
Fri 23/107:00 a.m. -
1 stop9h 24m
Mon 2/114:59 p.m. -
1 stop9h 08m
Deal found 10/9C$ 518
Tue 27/106:15 a.m. -
2 stops8h 40m
Thu 29/105:10 p.m. -
2 stops10h 50m
Deal found 13/9C$ 520
Fri 9/102:10 p.m. -
1 stop8h 00m
Sat 17/1010:15 a.m. -
1 stop14h 25m
Deal found 15/9C$ 521
Wed 2/129:25 a.m. -
2 stops9h 45m
Mon 7/127:30 a.m. -
2 stops13h 20m
Deal found 14/9C$ 522
Wed 11/116:10 a.m. -
1 stop7h 05m
Sun 15/115:00 a.m. -
1 stop8h 40m
Deal found 10/9C$ 525
Thu 15/109:29 p.m. -
Nonstop5h 12m
Mon 19/107:02 a.m. -
Nonstop5h 53m
Deal found 11/9C$ 527

Find flight deals from Seattle to Philadelphia

Round-trip from

C$ 496

One-way from

C$ 240

Popular in

December

Cheapest in

January

Average price

C$ 583
United Airlines
  • United Airlines
  • 10/10-13/10
  • 2 total stops
  • 16h 06m total
  • Seattle to Philadelphia
Search Deals
Southwest
  • Southwest
  • 13/11-31/12
  • 1 total stop
  • 7h 15m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (C$ 17 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 September 2026
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Cheapflights Fare Finder

 
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 Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 30/9

5:20 a.m.-4:00 p.m.

1 stop7h 40m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 289

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sat 31/10

9:35 a.m.-8:00 p.m.

1 stop7h 25m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 292

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 7/1

6:55 a.m.-5:00 p.m.

1 stop7h 05m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 292

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 25/11

12:15 a.m.-1:00 p.m.

2 stops9h 45m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 299

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sat 17/10

6:15 a.m.-8:05 p.m.

2 stops10h 50m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 299

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Mon 5/10

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

1 stop7h 30m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 303

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Fri 11/12

8:46 a.m.-4:56 p.m.

Nonstop5h 10m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 306

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sat 12/12

8:46 a.m.-4:56 p.m.

Nonstop5h 10m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 306

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sat 3/10

6:15 a.m.-8:00 p.m.

2 stops10h 45m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 310
Quickest round-trip

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sun 8/11

9:28 p.m.-5:32 a.m.

Nonstop5h 04m

Philadelphia

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 320

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/9

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

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 27 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, January is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 468). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 740). 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?

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?

Airfare is below average for this route at the moment.

Seattle to Philadelphia flights typically cost between C$ 499 and C$ 697 in October.
The cheapest round-trip price found within the last 5 days was C$ 496 on United Airlines (10 Oct-13 Oct).

Reviews of airlines servicing Philadelphia

Get a feel of what it's like to fly with Alaska Airlines from Seattle to Philadelphia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,931 reviews
Check prices

Food

7.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Alaska Airlines
7.9
Good
12,931 reviews
Alaska Airlines
7.9
Good
12,931 reviews
Check prices

Food

7.0

Boarding

8.1

Crew

8.5

Comfort

7.8

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Related info for your journey

  • What airports do I use to fly from Seattle to Philadelphia?

    If you book a flight from Seattle to Philadelphia, you will be flying from Seattle/Tacoma Intl to Philadelphia. Flights to Philadelphia (PHL) from Seattle/Tacoma Intl (SEA) take 5h 05m for a nonstop flight. There are 6 flights from Seattle/Tacoma Intl to Philadelphia per day from 1 airline.

  • How popular is this Seattle to Philadelphia flight route?

    This flight path from Seattle/Tacoma Intl to Philadelphia was viewed by 7 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$ 527, Alaska Airlines can have you in Philadelphia from Seattle in 5h 19m. Seattle and Philadelphia are separated by a distance of 3814 km. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Seattle to Philadelphia round-trip?

    Our cheapest airline available from Seattle to Philadelphia is Alaska Airlines. Our recent data shows that you can find tickets from as low as C$ 283 on this airline. Alaska Airlines is currently priced 51% below the average price you’ll pay for this route.

  • 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: Qatar Airways (100%), KLM (100%), STARLUX Airlines( 83%).

  • 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, January is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 468). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 740). 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
Voorhees
Reading
King of Prussia
Wildwood
West Chester

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Seattle to Philadelphia

AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 283AverageC$ 538FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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Cheapflights helps you search for flights from Seattle to Philadelphia via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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.

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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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