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Cheap flights from Seattle to Philadelphia from C$ 272

SEA — PHL
4 Oct — 11 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

Fri 23/109:29 p.m. -
Nonstop5h 12m
Mon 2/117:02 a.m. -
Nonstop6h 06m
Deal found 31/8C$ 523
Sat 12/99:33 a.m. -
Nonstop5h 23m
Tue 15/96:59 p.m. -
Nonstop5h 52m
Deal found 1/9C$ 534
Mon 9/119:38 p.m. -
Nonstop5h 05m
Sat 14/117:00 a.m. -
Nonstop6h 05m
Deal found 3/9C$ 536
Sat 24/109:29 p.m. -
Nonstop5h 14m
Wed 4/119:48 a.m. -
1 stop7h 57m
Deal found 2/9C$ 537
Thu 1/1011:14 p.m. -
1 stop7h 29m
Mon 5/106:30 p.m. -
1 stop9h 45m
Deal found 3/9C$ 543
Fri 25/127:10 p.m. -
1 stop7h 21m
Mon 4/11:01 p.m. -
1 stop9h 05m
Deal found 1/9C$ 544
Tue 22/99:27 p.m. -
Nonstop5h 13m
Tue 29/96:59 p.m. -
Nonstop5h 52m
Deal found 2/9C$ 545
Wed 30/97:00 a.m. -
1 stop7h 54m
Sun 4/106:00 a.m. -
1 stop9h 23m
Deal found 3/9C$ 547
Thu 24/129:32 p.m. -
Nonstop5h 09m
Tue 5/16:14 p.m. -
Nonstop6h 14m
Deal found 1/9C$ 548
Tue 6/1012:10 a.m. -
1 stop7h 30m
Wed 14/106:00 a.m. -
2 stops11h 20m
Deal found 2/9C$ 549
Fri 6/119:30 p.m. -
Nonstop5h 14m
Tue 10/113:00 p.m. -
1 stop8h 46m
Deal found 3/9C$ 551
Wed 14/1012:10 a.m. -
1 stop11h 30m
Fri 16/107:10 p.m. -
1 stop8h 30m
Deal found 1/9C$ 554

Find flight deals from Seattle to Philadelphia

Round-trip from

C$ 523

One-way from

C$ 272

Popular in

December

Cheapest in

January

Average price

C$ 562
Delta
  • Delta
  • 9/11-14/11
  • Nonstop
  • 11h 10m total
  • Seattle to Philadelphia
Search Deals
Southwest
  • Southwest
  • 3/12-31/12
  • 1 total stop
  • 7h 00m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (C$ 11 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 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

Mon 2/11

9:05 a.m.-10:49 p.m.

1 stop10h 44m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 272

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Mon 12/10

11:13 p.m.-12:25 p.m.

1 stop10h 12m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 272

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 10/9

11:00 p.m.-10:02 a.m.

1 stop8h 02m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 276

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sat 10/10

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$ 283

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 10/9

7:00 a.m.-9:10 p.m.

2 stops11h 10m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 283

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Fri 30/10

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$ 304

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Mon 26/10

9:19 a.m.-5:38 p.m.

Nonstop5h 19m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 304
Quickest round-trip

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Fri 26/2

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$ 304

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sun 8/11

9:30 p.m.-5:44 a.m.

Nonstop5h 14m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 318

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Thu 3/12

9:15 p.m.-5:27 a.m.

Nonstop5h 12m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 318

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/9

Showing 1-10 of 24 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 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, January is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 465). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 719). 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$ 493 and C$ 674 in October.
The cheapest round-trip price found within the last 5 days was C$ 523 on Alaska Airlines (23 Oct-30 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
12,876 reviews
Check prices

Overall

7.9

Entertainment

7.0

Comfort

7.8

Food

7.0

Boarding

8.1

Crew

8.5

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
12,876 reviews
Alaska Airlines
7.9
Good
12,876 reviews
Check prices

Overall

7.9

Entertainment

7.0

Comfort

7.8

Food

7.0

Boarding

8.1

Crew

8.5

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 12m for a nonstop flight. There are 5 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$ 523, 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$ 281 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$ 465). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 719). 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$ 281AverageC$ 535FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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Why should you use Cheapflights to find cheap flight tickets from Seattle to Philadelphia?

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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.

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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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