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Cheap flights from Seattle to Philadelphia from C$ 176

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 20/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
17 Jan — 24 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Philadelphia are usually found in October or January, booked 59 days in advance, depart on a Tuesday or Monday and return on a Monday

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 18 December 2025.

Wed 31/121:35 p.m.SEA - PHL
1 stop6h 43mDelta
Wed 7/16:00 a.m.PHL - SEA
1 stop7h 42mDelta
Deal found 16/12C$ 409
Wed 31/125:02 a.m.SEA - PHL
1 stop7h 45mUnited Airlines
Tue 6/16:30 a.m.PHL - SEA
1 stop8h 02mUnited Airlines
Deal found 16/12C$ 490
Wed 31/127:12 p.m.SEA - PHL
1 stop8h 57mUnited Airlines
Wed 7/110:30 a.m.PHL - SEA
2 stops13h 45mUnited Airlines
Deal found 16/12C$ 497
Wed 31/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Tue 6/16:44 p.m.PHL - SEA
Nonstop6h 15mAlaska Airlines
Deal found 16/12C$ 511
Wed 31/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Mon 5/17:00 a.m.PHL - SEA
Nonstop6h 04mAlaska Airlines
Deal found 16/12C$ 559
Mon 29/1212:55 a.m.SEA - PHL
1 stop6h 43mDelta
Wed 7/16:00 a.m.PHL - SEA
1 stop7h 42mDelta
Deal found 16/12C$ 588
Wed 31/121:35 p.m.SEA - PHL
1 stop6h 43mDelta
Tue 6/16:51 p.m.PHL - SEA
2 stops18h 54mDelta
Deal found 16/12C$ 595
Wed 31/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Wed 7/17:06 p.m.PHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 16/12C$ 635
Wed 31/129:29 p.m.SEA - PHL
Nonstop5h 08mAlaska Airlines
Fri 2/17:00 a.m.PHL - SEA
Nonstop6h 04mAlaska Airlines
Deal found 16/12C$ 656
Thu 25/125:54 p.m.SEA - PHL
1 stop8h 17mUnited Airlines
Fri 2/16:35 a.m.PHL - SEA
1 stop8h 28mUnited Airlines
Deal found 16/12C$ 661

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 18 December 2025.

Round-trip from

C$ 360

One-way from

C$ 176

Popular in

December

Cheapest in

October

Average price

C$ 890

Good round-trip deal

C$ 514 or less

Good one-way deal

C$ 424 or less
United Airlines
  • United Airlines
  • 15/1-20/1
  • 3 total stops
  • 21h 19m total
  • Seattle to Philadelphia
Search Deals
United Airlines
  • United Airlines
  • 20/1
  • 1 total stop
  • 7h 34m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 74 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (C$ 38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Philadelphia.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Philadelphia.
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 18 December 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

Fri 23/1

5:00 a.m.-6:54 p.m.

2 stops10h 54m

Philadelphia

Mon 26/1

3:01 p.m.-8:57 p.m.

1 stop8h 56m

C$ 361

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/2

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

Nonstop5h 09m

Philadelphia

Mon 23/2

6:20 p.m.-9:33 p.m.

Nonstop6h 13m

C$ 382

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 18/1

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

1 stop7h 23m

Philadelphia

Wed 21/1

6:15 a.m.-10:55 a.m.

1 stop7h 40m

C$ 382

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/2

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

Nonstop5h 09m

Philadelphia

Mon 9/2

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

Nonstop6h 23m

C$ 382

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 8/1

11:25 a.m.-11:14 p.m.

1 stop8h 49m

Philadelphia

Thu 15/1

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

1 stop7h 41m

C$ 409

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 9/1

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

1 stop7h 23m

Philadelphia

Fri 16/1

2:31 p.m.-10:50 p.m.

1 stop11h 19m

C$ 409

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 2/3

1:38 p.m.-11:46 p.m.

1 stop7h 08m

Philadelphia

Thu 5/3

7:00 a.m.-12:33 p.m.

1 stop8h 33m

C$ 409

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 9/1

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

2 stops9h 34m

Philadelphia

Mon 12/1

8:35 a.m.-3:44 p.m.

1 stop10h 09m

C$ 416

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/2

9:50 a.m.-10:15 p.m.

2 stops9h 25m

Philadelphia

Mon 9/2

1:40 p.m.-11:15 p.m.

2 stops12h 35m

C$ 446

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 25/2

12:00 p.m.-11:44 p.m.

1 stop8h 44m

Philadelphia

Sun 1/3

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

1 stop8h 19m

C$ 451

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/12

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 12 December 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$ 182). Flying from Seattle to Philadelphia in February is currently the most expensive (average of C$ 274). 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 18 December 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.

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$ 382, United 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 (88%), STARLUX Airlines (85%), Hawaiian Airlines( 75%).

  • 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$ 628, our data indicates the cheapest price to be C$ 189. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 328.

  • 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$ 182). Flying from Seattle to Philadelphia in February is currently the most expensive (average of C$ 274). 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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