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Cheap flights from Seattle to Philadelphia from C$ 177

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 24/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
26 feb. — 5 mar.1
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 27 enero 2026.

lun. 13/49:55 p.m.
SEA
-
PHL
Nonstop5h 10m
Alaska Airlines
mié. 22/47:22 a.m.
PHL
-
SEA
Nonstop5h 58m
Alaska Airlines
Deal found 26/1C$ 325
jue. 30/47:35 p.m.
SEA
-
PHL
1 stop7h 00m
Delta
dom. 10/57:05 a.m.
PHL
-
SEA
Nonstop5h 59m
Delta
Deal found 26/1C$ 338
lun. 23/29:19 a.m.
SEA
-
PHL
1 stop9h 14m
United Airlines
lun. 2/36:20 p.m.
PHL
-
SEA
1 stop9h 39m
United Airlines
Deal found 25/1C$ 346
mié. 25/211:15 p.m.
SEA
-
PHL
1 stop6h 35m
Delta
lun. 2/36:50 p.m.
PHL
-
SEA
1 stop8h 19m
Delta
Deal found 26/1C$ 352
mar. 24/27:00 a.m.
SEA
-
PHL
1 stop7h 14m
United Airlines
mar. 3/310:35 a.m.
PHL
-
SEA
2 stops11h 28m
United Airlines
Deal found 25/1C$ 359
mar. 12/59:20 p.m.
SEA
-
PHL
1 stop9h 17m
Delta
jue. 14/57:05 a.m.
PHL
-
SEA
Nonstop5h 59m
Delta
Deal found 26/1C$ 366
mié. 18/29:19 a.m.
SEA
-
PHL
1 stop9h 14m
United Airlines
mié. 25/212:55 p.m.
PHL
-
SEA
1 stop9h 08m
United Airlines
Deal found 27/1C$ 374
vie. 22/59:50 p.m.
SEA
-
PHL
Nonstop5h 15m
Delta
dom. 24/57:05 a.m.
PHL
-
SEA
Nonstop5h 59m
Delta
Deal found 27/1C$ 379
mar. 24/26:05 a.m.
SEA
-
PHL
2 stops11h 15m
Southwest
mar. 3/35:00 p.m.
PHL
-
SEA
1 stop8h 30m
Southwest
Deal found 26/1C$ 386
mar. 24/35:20 p.m.
SEA
-
PHL
1 stop10h 55m
United Airlines
jue. 2/411:36 a.m.
PHL
-
SEA
1 stop8h 01m
United Airlines
Deal found 26/1C$ 397
lun. 13/49:55 p.m.
SEA
-
PHL
Nonstop5h 10m
Alaska Airlines
lun. 20/46:47 p.m.
PHL
-
SEA
Nonstop6h 05m
Alaska Airlines
Deal found 26/1C$ 400

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 27 enero 2026.

Round-trip from

C$ 325

One-way from

C$ 177

Popular in

December

Cheapest in

October

Average price

C$ 504
Alaska Airlines
  • Alaska Airlines
  • 15/4-21/4
  • Nonstop
  • 11h 15m total
  • Seattle to Philadelphia
Search Deals
United Airlines
  • United Airlines
  • 11/3
  • 1 total stop
  • 7h 14m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 27 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 January 2026
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 27 enero 2026.
Use the filters below to find and compare flights from Seattle to Philadelphia that are best for you.

Fly from

Seattle

Fly to

Philadelphia

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

vie. 17/4

6:00 a.m.-6:08 p.m.

1 stop9h 08m

Philadelphia

sáb. 25/4

7:00 a.m.-2:46 p.m.

1 stop10h 46m

C$ 352

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 24/2

10:55 a.m.-9:09 p.m.

1 stop7h 14m

Philadelphia

mar. 3/3

12:55 p.m.-7:03 p.m.

1 stop9h 08m

C$ 352

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 25/2

6:00 a.m.-4:32 p.m.

1 stop7h 32m

Philadelphia

lun. 2/3

6:50 p.m.-12:09 a.m.

1 stop8h 19m

C$ 352

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 31/3

9:55 p.m.-6:05 a.m.

Nonstop5h 10m

Philadelphia

mar. 7/4

7:25 a.m.-10:30 a.m.

Nonstop6h 05m

C$ 379

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 27/5

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

Nonstop5h 15m

Philadelphia

jue. 4/6

7:05 a.m.-10:04 a.m.

Nonstop5h 59m

C$ 379

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

vie. 22/5

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

Nonstop5h 15m

Philadelphia

dom. 24/5

7:05 a.m.-10:04 a.m.

Nonstop5h 59m

C$ 379

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

sáb. 23/5

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

Nonstop5h 15m

Philadelphia

mié. 27/5

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

1 stop8h 21m

C$ 393

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 25/2

6:15 a.m.-6:52 p.m.

1 stop9h 37m

C$ 177

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 11/3

6:32 a.m.-11:32 p.m.

2 stops14h 00m

C$ 183

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

dom. 22/3

9:55 p.m.-6:05 a.m.

Nonstop5h 10m

C$ 190

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/1

Showing 1-10 of 18 results
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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 23 January 2026.

The best time to book flights from Seattle to Philadelphia is 69 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, December is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 177). Flying from Seattle to Philadelphia in February is currently the most expensive (average of C$ 271). 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 27 enero 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.

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 5 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$ 325, Alaska Airlines can have you in Philadelphia from Seattle in 5h 10m. Seattle and Philadelphia are separated by a distance of 3814 km. This flight may include one or multiple stops.

  • 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%), British Airways (100%), American Airlines( 89%).

  • 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, December is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 177). Flying from Seattle to Philadelphia in February is currently the most expensive (average of C$ 271). 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
King of Prussia
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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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