Find flights
Deals
When to book
FAQs

Cheap flights from Seattle to Philadelphia from C$ 195

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 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
3 Dec — 10 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 3 November 2025.

Thu 4/125:25 a.m.SEA - PHL
1 stop9h 15mDelta
Wed 10/126:07 p.m.PHL - SEA
1 stop8h 51mDelta
Deal found 3/11C$ 375
Wed 3/125:00 a.m.SEA - PHL
2 stops9h 39mUnited Airlines
Wed 10/126:30 a.m.PHL - SEA
1 stop8h 17mUnited Airlines
Deal found 3/11C$ 382
Sat 6/126:00 a.m.SEA - PHL
2 stops11h 35mSouthwest
Sun 7/126:35 p.m.PHL - SEA
1 stop9h 00mSouthwest
Deal found 3/11C$ 399
Wed 10/126:35 a.m.SEA - PHL
1 stop7h 45mSouthwest
Thu 11/125:00 p.m.PHL - SEA
1 stop8h 55mSouthwest
Deal found 2/11C$ 403
Wed 3/127:05 a.m.SEA - PHL
2 stops11h 10mSouthwest
Wed 10/122:45 p.m.PHL - SEA
2 stops11h 10mSouthwest
Deal found 3/11C$ 406
Thu 4/125:40 a.m.SEA - PHL
1 stop13h 55mSouthwest
Wed 10/121:50 p.m.PHL - SEA
2 stops12h 05mSouthwest
Deal found 3/11C$ 407
Thu 4/127:05 a.m.SEA - PHL
2 stops10h 55mSouthwest
Sun 7/126:35 p.m.PHL - SEA
1 stop9h 00mSouthwest
Deal found 3/11C$ 438
Tue 2/127:34 p.m.SEA - PHL
2 stops11h 01mUnited Airlines
Tue 9/125:07 p.m.PHL - SEA
1 stop8h 21mUnited Airlines
Deal found 2/11C$ 452
Mon 1/1211:10 p.m.SEA - PHL
1 stop6h 35mDelta
Mon 8/126:07 p.m.PHL - SEA
1 stop8h 51mDelta
Deal found 3/11C$ 480
Fri 5/129:35 p.m.SEA - PHL
Nonstop5h 11mAlaska Airlines
Sat 6/129:02 a.m.PHL - SEA
1 stop14h 57mAlaska Airlines
Deal found 2/11C$ 487

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 3 November 2025.

Round-trip from

C$ 368

One-way from

C$ 202

Popular in

December

Cheapest in

October

Average price

C$ 626
United Airlines
  • United Airlines
  • 28/2-4/3
  • 2 total stops
  • 18h 22m total
  • Seattle to Philadelphia
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 3/2
  • Nonstop
  • 5h 09m 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$ 28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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 3 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 2/12

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

1 stop9h 15m

Philadelphia

Fri 12/12

6:30 p.m.-12:24 a.m.

1 stop8h 54m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 4/12

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

Nonstop5h 11m

Philadelphia

Sat 6/12

6:54 p.m.-10:12 p.m.

Nonstop6h 18m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 6/12

5:00 a.m.-3:00 p.m.

1 stop7h 00m

Philadelphia

Sun 7/12

6:35 p.m.-12:35 a.m.

1 stop9h 00m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 3/12

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

1 stop9h 41m

Philadelphia

Wed 10/12

6:30 a.m.-11:47 a.m.

1 stop8h 17m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 4/12

1:47 p.m.-11:57 p.m.

1 stop7h 10m

Philadelphia

Mon 8/12

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

1 stop8h 52m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 4/12

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$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 10/12

7:00 a.m.-5:39 p.m.

1 stop7h 39m

Philadelphia

Sat 13/12

6:30 a.m.-11:47 a.m.

1 stop8h 17m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 3/12

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

1 stop9h 15m

Philadelphia

Sat 6/12

6:18 a.m.-10:54 a.m.

1 stop7h 36m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 2/12

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

Nonstop5h 11m

Philadelphia

Tue 9/12

6:54 p.m.-10:12 p.m.

Nonstop6h 18m

C$ 375

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 2/12

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

Nonstop5h 11m

Philadelphia

Wed 10/12

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

Nonstop6h 14m

C$ 375

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/11

Showing 1-10 of 23 results
1
2
3

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 31 October 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, November is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 180). Flying from Seattle to Philadelphia in January is currently the most expensive (average of C$ 313). 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 3 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$ 375, Delta can have you in Philadelphia from Seattle in 5h 11m. 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, November is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 180). Flying from Seattle to Philadelphia in January is currently the most expensive (average of C$ 313). 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
Reading

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Philadelphia?

Cheapflights helps you search for flights from Seattle to Philadelphia via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.