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Cheap flights from Seattle to Philadelphia from C$ 202

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 28/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
13 Dec — 20 Dec1
1 adult
1 adult, Economy, 0 bags

Find 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 13 November 2025.

Fri 5/129:35 p.m.SEA - PHL
Nonstop5h 11mAlaska Airlines
Mon 8/126:54 p.m.PHL - SEA
Nonstop6h 18mAlaska Airlines
Deal found 12/11C$ 360
Sun 14/126:00 a.m.SEA - PHL
1 stop9h 12mDelta
Wed 7/15:17 p.m.PHL - SEA
1 stop7h 32mDelta
Deal found 10/11C$ 374
Sat 6/127:00 a.m.SEA - PHL
1 stop9h 41mUnited Airlines
Tue 9/1212:45 p.m.PHL - SEA
1 stop9h 37mUnited Airlines
Deal found 11/11C$ 381
Sat 6/129:44 a.m.SEA - PHL
Nonstop5h 09mAlaska Airlines
Mon 8/126:54 p.m.PHL - SEA
Nonstop6h 18mAlaska Airlines
Deal found 11/11C$ 388
Tue 9/127:34 p.m.SEA - PHL
2 stops11h 01mUnited Airlines
Sun 14/126:30 a.m.PHL - SEA
1 stop8h 17mUnited Airlines
Deal found 12/11C$ 395
Tue 16/129:44 a.m.SEA - PHL
Nonstop5h 09mAlaska Airlines
Fri 9/17:06 p.m.PHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 10/11C$ 402
Mon 24/119:36 p.m.SEA - PHL
Nonstop5h 11mAlaska Airlines
Wed 3/126:54 p.m.PHL - SEA
Nonstop6h 18mAlaska Airlines
Deal found 11/11C$ 409
Wed 17/127:00 a.m.SEA - PHL
1 stop7h 39mUnited Airlines
Tue 6/16:30 a.m.PHL - SEA
1 stop8h 02mUnited Airlines
Deal found 10/11C$ 412
Fri 5/129:35 p.m.SEA - PHL
Nonstop5h 11mAlaska Airlines
Sun 7/127:06 a.m.PHL - SEA
Nonstop6h 14mAlaska Airlines
Deal found 11/11C$ 416
Tue 16/129:35 p.m.SEA - PHL
Nonstop5h 11mAlaska Airlines
Wed 7/17:06 p.m.PHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 10/11C$ 423
Thu 4/1212:35 p.m.SEA - PHL
1 stop7h 47mUnited Airlines
Mon 8/126:30 a.m.PHL - SEA
2 stops11h 59mUnited Airlines
Deal found 12/11C$ 429
Thu 27/1111:55 p.m.SEA - PHL
1 stop7h 56mDelta
Tue 16/126:18 a.m.PHL - SEA
1 stop9h 40mDelta
Deal found 11/11C$ 430

Cheap 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 13 November 2025.

Round-trip from

C$ 360

One-way from

C$ 202

Popular in

December

Cheapest in

October

Average price

C$ 580
Alaska Airlines
  • Alaska Airlines
  • 5/12-8/12
  • Nonstop
  • 11h 29m total
  • Seattle to Philadelphia
Search Deals
United Airlines
  • United Airlines
  • 28/1
  • 2 total stops
  • 13h 27m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 84 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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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 13 November 2025.
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

Tue 9/12

9:44 a.m.-5:53 p.m.

Nonstop5h 09m

Philadelphia

Tue 16/12

7:06 a.m.-10:20 a.m.

Nonstop6h 14m

C$ 360

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 6/12

9:35 p.m.-5:46 a.m.

Nonstop5h 11m

Philadelphia

Tue 9/12

7:06 a.m.-10:20 a.m.

Nonstop6h 14m

C$ 360

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 10/1

12:00 p.m.-12:23 a.m.

1 stop9h 23m

Philadelphia

Sat 17/1

5:40 a.m.-12:20 p.m.

1 stop9h 40m

C$ 374

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 29/1

5:00 a.m.-5:27 p.m.

1 stop9h 27m

Philadelphia

Fri 6/2

4:59 p.m.-11:15 p.m.

1 stop9h 16m

C$ 374

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 9/12

7:00 a.m.-7:41 p.m.

1 stop9h 41m

Philadelphia

Tue 16/12

5:07 p.m.-10:28 p.m.

1 stop8h 21m

C$ 388

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 10/1

6:05 a.m.-4:30 p.m.

1 stop7h 25m

Philadelphia

Wed 14/1

9:40 a.m.-2:21 p.m.

1 stop7h 41m

C$ 388

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 4/12

5:25 a.m.-5:40 p.m.

1 stop9h 15m

Philadelphia

Mon 8/12

7:05 a.m.-12:57 p.m.

1 stop8h 52m

C$ 388

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 23/1

11:10 p.m.-8:52 a.m.

1 stop6h 42m

Philadelphia

Sun 25/1

6:00 a.m.-10:47 a.m.

1 stop7h 47m

C$ 388

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 6/2

12:00 p.m.-11:57 p.m.

1 stop8h 57m

Philadelphia

Sun 8/2

5:17 p.m.-9:49 p.m.

1 stop7h 32m

C$ 388

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/2

5:00 a.m.-5:27 p.m.

1 stop9h 27m

Philadelphia

Mon 9/2

7:00 a.m.-3:08 p.m.

1 stop11h 08m

C$ 388

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/11

Showing 1-10 of 21 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 7 November 2025.

The best time to book flights from Seattle to Philadelphia is 59 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, March is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 191). Flying from Seattle to Philadelphia in January is currently the most expensive (average of C$ 308). 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 13 November 2025.

One of the essential ways to save on airfare from Seattle to Philadelphia is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the afternoon could potentially save you up to 48% on airfare.

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 6 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$ 360, Alaska Airlines can have you in Philadelphia from Seattle in 5h 09m. 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: American Airlines (89%), Air Tahiti Nui (86%), STARLUX Airlines( 84%).

  • 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, March is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 191). Flying from Seattle to Philadelphia in January is currently the most expensive (average of C$ 308). 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?

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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.

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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