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Cheap flights from Seattle to Philadelphia from C$ 220

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 14/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
22 Aug — 29 Aug1
1 adult

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 17 August 2025.

Round-trip from

C$ 383

One-way from

C$ 220

Popular in

December

Cheapest in

March

Average price

C$ 672
Hawaiian Airlines
  • Hawaiian Airlines
  • 7/11-15/11
  • Nonstop
  • 11h 30m total
  • Seattle to Philadelphia
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Alaska Airlines
  • Alaska Airlines
  • 14/10
  • Nonstop
  • 5h 17m total
  • Seattle to Philadelphia
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Highest demand for flights based on searches. 5% potential increase in price (C$ 47 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 25 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Seattle to Philadelphia

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 17 August 2025.

Wed 5/115:25 a.m.SEA - PHL
1 stop9h 13mDelta
Tue 11/116:15 p.m.PHL - SEA
1 stop8h 59mDelta
Deal found 16/8C$ 383
Sat 6/96:10 a.m.SEA - PHL
1 stop8h 54mDelta
Wed 10/97:00 a.m.PHL - SEA
1 stop10h 43mDelta
Deal found 16/8C$ 386
Fri 26/99:45 p.m.SEA - PHL
Nonstop5h 17mHawaiian Airlines
Sun 28/97:22 a.m.PHL - SEA
Nonstop5h 56mHawaiian Airlines
Deal found 14/8C$ 387
Mon 22/911:40 p.m.SEA - PHL
1 stop7h 54mDelta
Mon 6/107:00 p.m.PHL - SEA
1 stop7h 57mDelta
Deal found 16/8C$ 388
Wed 1/106:00 a.m.SEA - PHL
1 stop7h 38mDelta
Mon 6/107:00 p.m.PHL - SEA
1 stop7h 57mDelta
Deal found 14/8C$ 390
Fri 7/119:30 p.m.SEA - PHL
Nonstop5h 12mAlaska Airlines
Sat 15/117:02 a.m.PHL - SEA
Nonstop6h 11mAlaska Airlines
Deal found 15/8C$ 394
Fri 7/1111:55 p.m.SEA - PHL
1 stop8h 01mDelta
Tue 11/117:00 a.m.PHL - SEA
1 stop10h 45mDelta
Deal found 15/8C$ 397
Fri 10/109:23 p.m.SEA - PHL
Nonstop5h 17mAlaska Airlines
Fri 17/107:11 p.m.PHL - SEA
Nonstop6h 21mAlaska Airlines
Deal found 15/8C$ 403
Wed 24/95:35 a.m.SEA - PHL
1 stop9h 05mSouthwest
Sun 28/95:30 a.m.PHL - SEA
1 stop8h 25mSouthwest
Deal found 16/8C$ 405
Fri 10/109:23 p.m.SEA - PHL
Nonstop5h 17mAlaska Airlines
Sun 12/107:00 a.m.PHL - SEA
Nonstop5h 49mAlaska Airlines
Deal found 15/8C$ 410
Wed 24/911:46 a.m.SEA - PHL
1 stop8h 33mDelta
Wed 1/107:00 a.m.PHL - SEA
1 stop10h 39mDelta
Deal found 15/8C$ 412

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 17 August 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 7/11

9:30 p.m.-5:42 a.m.

Nonstop5h 12m

Philadelphia

Sat 15/11

7:12 p.m.-10:30 p.m.

Nonstop6h 18m

C$ 383

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 24/9

11:46 a.m.-11:19 p.m.

1 stop8h 33m

Philadelphia

Wed 1/10

5:15 p.m.-11:54 p.m.

1 stop9h 39m

C$ 383

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/11

9:30 p.m.-5:42 a.m.

Nonstop5h 12m

Philadelphia

Tue 11/11

7:12 p.m.-10:30 p.m.

Nonstop6h 18m

C$ 383

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 1/10

6:00 a.m.-6:06 p.m.

1 stop9h 06m

Philadelphia

Tue 21/10

6:18 p.m.-11:54 p.m.

1 stop8h 36m

C$ 383

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 10/9

9:45 p.m.-6:02 a.m.

Nonstop5h 17m

Philadelphia

Tue 16/9

7:22 a.m.-10:18 a.m.

Nonstop5h 56m

C$ 383

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 10/9

6:00 a.m.-5:50 p.m.

1 stop8h 50m

Philadelphia

Tue 16/9

8:00 a.m.-2:04 p.m.

1 stop9h 04m

C$ 383

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 24/11

9:29 p.m.-5:33 a.m.

Nonstop5h 04m

Philadelphia

Sat 6/12

6:35 p.m.-9:47 p.m.

Nonstop6h 12m

C$ 383

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/11

9:30 p.m.-5:42 a.m.

Nonstop5h 12m

Philadelphia

Wed 12/11

7:12 p.m.-10:30 p.m.

Nonstop6h 18m

C$ 383

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/11

5:25 a.m.-5:38 p.m.

1 stop9h 13m

Philadelphia

Tue 18/11

4:00 p.m.-12:14 a.m.

1 stop11h 14m

C$ 383

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 8/10

6:00 a.m.-5:55 p.m.

1 stop8h 55m

Philadelphia

Wed 22/10

7:05 a.m.-2:45 p.m.

1 stop10h 40m

C$ 383

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/8

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 8 August 2025.

The best time to book flights from Seattle to Philadelphia is 86 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$ 388). Flying from Seattle to Philadelphia in September is currently the most expensive (average of C$ 418). 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 17 August 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 at noon could potentially save you up to 62% on airfare.

Weekly flight availability from Seattle to Philadelphia

Explore weekly flight availability from Seattle to Philadelphia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 17 August 2025.

The most flights from SEA to PHL are scheduled on a Saturday (10 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 on average).

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 7 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines to fly from Seattle to Philadelphia one-way?

    One-way options have recently been found by users for as low as C$ 220 on Alaska Airlines. Other airlines that offer cheap prices include Delta from C$ 221 and Southwest from C$ 222 one-way.

  • 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 (80%), Finnair (77%), Hawaiian Airlines( 67%).

  • 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$ 388). Flying from Seattle to Philadelphia in September is currently the most expensive (average of C$ 418). 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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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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