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Cheap flights from Seattle to Philadelphia from C$ 189

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 17/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
26 Dec — 2 Jan1
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 26 November 2025.

Wed 31/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Mon 12/17:06 p.m.PHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 24/11C$ 363
Mon 29/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Thu 8/17:06 p.m.PHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 24/11C$ 377
Fri 26/127:30 p.m.SEA - PHL
1 stop7h 20mDelta
Sun 4/15:19 p.m.PHL - SEA
1 stop9h 33mDelta
Deal found 24/11C$ 391
Tue 30/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Fri 9/17:06 p.m.PHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 24/11C$ 405
Mon 29/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Tue 6/17:00 a.m.PHL - SEA
Nonstop6h 04mAlaska Airlines
Deal found 23/11C$ 412
Mon 29/127:30 p.m.SEA - PHL
1 stop7h 20mDelta
Thu 8/16:00 a.m.PHL - SEA
1 stop7h 42mDelta
Deal found 25/11C$ 419
Fri 26/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Sat 10/17:06 p.m.PHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 24/11C$ 426
Tue 16/129:35 p.m.SEA - PHL
Nonstop5h 11mAlaska Airlines
Thu 18/127:00 a.m.PHL - SEA
Nonstop6h 04mAlaska Airlines
Deal found 24/11C$ 433
Mon 29/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Mon 5/17:00 a.m.PHL - SEA
Nonstop6h 04mAlaska Airlines
Deal found 23/11C$ 440
Fri 26/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Sun 11/17:06 p.m.PHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 24/11C$ 454
Sun 28/124:57 p.m.SEA - PHL
1 stop9h 53mDelta
Sat 10/17:00 a.m.PHL - SEA
1 stop8h 33mDelta
Deal found 24/11C$ 461
Mon 29/125:54 p.m.SEA - PHL
1 stop8h 17mUnited Airlines
Thu 8/110:30 a.m.PHL - SEA
2 stops10h 56mUnited Airlines
Deal found 24/11C$ 468

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 26 November 2025.

Round-trip from

C$ 363

One-way from

C$ 189

Popular in

December

Cheapest in

October

Average price

C$ 624

Good round-trip deal

C$ 526 or less
Delta
  • Delta
  • 7/1-14/1
  • 2 total stops
  • 16h 08m total
  • Seattle to Philadelphia
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United Airlines
  • United Airlines
  • 17/12
  • 2 total stops
  • 11h 21m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 79 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 29 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Philadelphia.
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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 26 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 13/1

12:00 p.m.-11:56 p.m.

1 stop8h 56m

Philadelphia

Sat 17/1

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

1 stop7h 32m

C$ 363

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 6/1

9:34 a.m.-5:44 p.m.

Nonstop5h 10m

Philadelphia

Mon 12/1

7:06 p.m.-10:29 p.m.

Nonstop6h 23m

C$ 363

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 6/1

9:34 a.m.-5:44 p.m.

Nonstop5h 10m

Philadelphia

Thu 15/1

7:06 p.m.-10:29 p.m.

Nonstop6h 23m

C$ 363

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 10/1

6:15 a.m.-5:42 p.m.

1 stop8h 27m

Philadelphia

Sun 11/1

11:27 a.m.-4:45 p.m.

1 stop8h 18m

C$ 377

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 15/1

7:00 a.m.-5:34 p.m.

1 stop7h 34m

Philadelphia

Sun 18/1

8:09 a.m.-1:57 p.m.

1 stop8h 48m

C$ 384

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 17/1

9:54 a.m.-6:03 p.m.

Nonstop5h 09m

Philadelphia

Tue 20/1

7:06 p.m.-10:29 p.m.

Nonstop6h 23m

C$ 391

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 11/1

11:10 p.m.-8:50 a.m.

1 stop6h 40m

Philadelphia

Sun 18/1

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

1 stop7h 32m

C$ 391

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 10/1

6:05 a.m.-4:28 p.m.

1 stop7h 23m

Philadelphia

Fri 16/1

4:59 p.m.-10:50 p.m.

1 stop8h 51m

C$ 447

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 8/1

9:54 a.m.-6:03 p.m.

Nonstop5h 09m

Philadelphia

Fri 16/1

7:06 p.m.-10:29 p.m.

Nonstop6h 23m

C$ 447

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 7/1

12:00 p.m.-11:56 p.m.

1 stop8h 56m

Philadelphia

Fri 16/1

4:59 p.m.-10:50 p.m.

1 stop8h 51m

C$ 447

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/11

Showing 1-10 of 22 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 21 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, December is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 186). Flying from Seattle to Philadelphia in January is currently the most expensive (average of C$ 301). 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 26 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 morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 61% on airfare.

How much does it cost to fly round-trip from Seattle to Philadelphia?

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$ 363, Delta can have you in Philadelphia from Seattle in 10h 26m. Seattle and Philadelphia are separated by a distance of 3814 km.

  • 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%), STARLUX Airlines (87%), Qatar Airways( 85%).

  • What are the cheapest flights from Seattle to Philadelphia?

    Looking for the cheapest flight from Seattle to Philadelphia? While on average our users pay C$ 560, our data indicates the cheapest price to be C$ 513. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 389.

  • 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$ 186). Flying from Seattle to Philadelphia in January is currently the most expensive (average of C$ 301). 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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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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