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Cheap flights from Seattle to Philadelphia from C$ 289

SEA — PHL
10 Dec — 17 Dec1
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 5/128:25 a.m. -
1 stop7h 15m
Mon 4/16:30 p.m. -
1 stop9h 10m
Deal found 5/11C$ 564
Fri 4/129:25 a.m. -
2 stops9h 45m
Fri 11/122:30 p.m. -
2 stops11h 35m
Deal found 5/11C$ 567
Fri 11/129:05 a.m. -
Nonstop5h 03m
Tue 15/127:00 a.m. -
Nonstop6h 28m
Deal found 9/11C$ 574
Tue 29/129:18 a.m. -
Nonstop5h 07m
Thu 7/16:14 p.m. -
Nonstop6h 14m
Deal found 7/11C$ 576
Sun 13/129:35 p.m. -
Nonstop5h 05m
Mon 14/126:11 p.m. -
Nonstop6h 42m
Deal found 9/11C$ 577
Fri 11/125:30 a.m. -
1 stop9h 17m
Tue 15/127:10 a.m. -
1 stop12h 45m
Deal found 9/11C$ 587
Tue 8/128:15 p.m. -
2 stops11h 50m
Thu 10/127:30 a.m. -
2 stops11h 30m
Deal found 5/11C$ 588
Wed 30/127:10 p.m. -
1 stop7h 21m
Wed 6/19:00 a.m. -
1 stop10h 39m
Deal found 7/11C$ 590
Wed 30/127:10 p.m. -
1 stop7h 21m
Sun 10/19:55 a.m. -
1 stop9h 08m
Deal found 9/11C$ 595
Sat 5/1210:48 a.m. -
1 stop7h 50m
Wed 9/129:20 a.m. -
1 stop10h 02m
Deal found 8/11C$ 597
Thu 10/125:57 p.m. -
1 stop8h 58m
Wed 16/127:10 a.m. -
1 stop10h 33m
Deal found 9/11C$ 598
Fri 11/127:54 p.m. -
1 stop7h 01m
Mon 14/126:59 p.m. -
1 stop8h 06m
Deal found 9/11C$ 602

Find flight deals from Seattle to Philadelphia

Round-trip from

C$ 560

One-way from

C$ 289

Popular in

December

Cheapest in

January

Average price

C$ 646
Southwest
  • Southwest
  • 15/1-18/1
  • 3 total stops
  • 19h 50m total
  • Seattle to Philadelphia
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 20/12-31/12
  • Nonstop
  • 5h 09m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (C$ 18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2026
Search Deals

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
Quickest round-trip

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 30/12

7:10 p.m.-5:31 a.m.

1 stop7h 21m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 295

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Mon 14/12

7:00 a.m.-5:57 p.m.

1 stop7h 57m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 302

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sat 19/12

8:15 p.m.-10:25 a.m.

2 stops11h 10m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 309

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sun 20/12

11:00 a.m.-12:35 a.m.

2 stops10h 35m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 309

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Tue 29/12

11:44 p.m.-2:13 p.m.

2 stops11h 29m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 309

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sat 13/2

12:10 a.m.-1:30 p.m.

2 stops10h 20m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 309

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Tue 8/12

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

2 stops9h 00m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 310

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Wed 2/12

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

2 stops9h 00m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 310

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Sat 2/1

5:50 a.m.-9:55 p.m.

1 stop13h 05m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 337

SeattlePhiladelphia

SEA Seattle/Tacoma Intl - PHL Philadelphia

SEAPHL

Seattle/Tacoma Intl

Fri 27/11

7:00 a.m.-5:47 p.m.

1 stop7h 47m

Philadelphia

Wed 31/12

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

Nonstop0h 00m

C$ 358

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

Showing 1-10 of 21 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 62 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$ 490). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 751). 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$ 560 and C$ 848 in February.
The cheapest round-trip price found within the last 5 days was C$ 560 on United Airlines (3 Feb-7 Feb).

Reviews of airlines servicing Philadelphia

Get a feel of what it's like to fly with Alaska Airlines and American 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
13,159 reviews
Check prices

Food

7.0

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Overall

7.9

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
13,159 reviews
Alaska Airlines
7.9
Good
13,159 reviews
Check prices

Food

7.0

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Overall

7.9

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.
American Airlines
7.0
Good
12,226 reviews
Alaska Airlines
7.9
Good
13,159 reviews
Check prices

Food

7.0

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Overall

7.9

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 05m for a nonstop flight. There are 5 flights from Seattle/Tacoma Intl to Philadelphia per day from 2 airlines.

  • How popular is this Seattle to Philadelphia flight route?

    This flight path from Seattle/Tacoma Intl to Philadelphia was viewed by 12 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$ 604, United Airlines can have you in Philadelphia from Seattle in 7h 25m. Seattle and Philadelphia are separated by a distance of 3814 km. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Seattle to Philadelphia round-trip?

    Our cheapest airline available from Seattle to Philadelphia is American Airlines. Our recent data shows that you can find tickets from as low as C$ 390 on this airline. An additional option worth looking into is Alaska Airlines, starting at C$ 464. American Airlines is currently priced 36% 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 (96%), Cathay Pacific (91%), Alaska Airlines( 90%).

  • 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$ 490). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 751). 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 2 airlines flying from Seattle to Philadelphia

AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapestC$ 390AverageC$ 630FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Alaska AirlinesCheapestC$ 464AverageC$ 546FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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How does Cheapflights help users find flights from Seattle to Philadelphia?

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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