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Cheap flights from Seattle to Philadelphia from C$ 267

SEA — PHL
26 Oct — 2 Nov1
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 24/106:15 a.m. -
2 stops10h 50m
Sat 31/105:00 a.m. -
1 stop8h 00m
Deal found 24/9C$ 512
Sat 24/106:15 a.m. -
2 stops10h 50m
Thu 29/105:10 p.m. -
2 stops10h 50m
Deal found 24/9C$ 519
Wed 18/119:25 a.m. -
2 stops9h 45m
Thu 19/111:25 p.m. -
1 stop13h 10m
Deal found 24/9C$ 520
Fri 30/1010:50 a.m. -
1 stop9h 20m
Tue 3/111:20 p.m. -
1 stop8h 43m
Deal found 24/9C$ 526
Thu 29/1010:50 a.m. -
1 stop9h 19m
Tue 3/116:15 a.m. -
1 stop9h 04m
Deal found 23/9C$ 533
Thu 22/102:10 p.m. -
1 stop8h 00m
Wed 28/106:00 a.m. -
2 stops11h 20m
Deal found 22/9C$ 540
Wed 18/1111:20 a.m. -
1 stop7h 05m
Sat 21/117:10 p.m. -
1 stop8h 35m
Deal found 24/9C$ 542
Thu 22/1011:35 a.m. -
2 stops10h 35m
Tue 27/106:00 a.m. -
2 stops11h 20m
Deal found 22/9C$ 547
Sat 5/126:45 a.m. -
1 stop7h 25m
Mon 4/15:00 a.m. -
1 stop8h 40m
Deal found 26/9C$ 549
Thu 29/105:50 a.m. -
1 stop10h 10m
Sun 1/111:50 p.m. -
1 stop13h 50m
Deal found 25/9C$ 554
Fri 23/1011:13 p.m. -
1 stop7h 58m
Wed 28/101:16 p.m. -
1 stop8h 47m
Deal found 24/9C$ 556
Wed 4/118:32 a.m. -
Nonstop5h 13m
Mon 9/117:02 a.m. -
Nonstop6h 06m
Deal found 25/9C$ 562

Find flight deals from Seattle to Philadelphia

Round-trip from

C$ 512

One-way from

C$ 267

Popular in

December

Cheapest in

January

Average price

C$ 598
Southwest
  • Southwest
  • 18/11-19/11
  • 2 total stops
  • 20h 15m total
  • Seattle to Philadelphia
Search Deals
United Airlines
  • United Airlines
  • 13/10-31/12
  • 1 total stop
  • 7h 56m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (C$ 16 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 23 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

Thu 5/11

10:50 a.m.-11:09 p.m.

1 stop9h 19m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 267

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Mon 21/12

8:30 p.m.-10:25 a.m.

2 stops10h 55m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 274

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Fri 6/11

5:23 p.m.-7:39 a.m.

1 stop11h 16m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 290

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Mon 4/1

5:30 a.m.-4:40 p.m.

1 stop8h 10m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 297

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sun 25/10

9:29 p.m.-5:41 a.m.

Nonstop5h 12m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 324
Quickest round-trip

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 18/11

9:38 p.m.-5:43 a.m.

Nonstop5h 05m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 324

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 18/3

9:45 p.m.-5:55 a.m.

Nonstop5h 10m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 325

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Tue 24/11

9:38 p.m.-5:43 a.m.

Nonstop5h 05m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 325

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sun 21/3

9:45 p.m.-5:55 a.m.

Nonstop5h 10m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 325

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Tue 22/12

11:59 p.m.-10:52 a.m.

1 stop7h 53m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 339

Flights are sorted by cheapest round-trip flights first.

Deals found on 21/9

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 57 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$ 477). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 765). 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 typical for this route at the moment.

Seattle to Philadelphia flights typically cost between C$ 417 and C$ 655 in October.
The cheapest round-trip price found within the last 5 days was C$ 512 on Southwest (24 Oct-31 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
12,976 reviews
Check prices

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

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
12,976 reviews
Alaska Airlines
7.9
Good
12,976 reviews
Check prices

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

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 03m for a nonstop flight. There are 7 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$ 562, Southwest can have you in Philadelphia from Seattle in 5h 13m. 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$ 288 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%), Delta( 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$ 477). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 765). 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$ 288AverageC$ 548FlexibilityNo 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.

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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