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Cheap flights from Seattle to Philadelphia from C$ 209

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 14/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
13 nov. — 20 nov.1
1 adult
1 adult, Economy

Find flight deals from Seattle to Philadelphia

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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 14 octubre 2025.

mar. 11/119:30 p.m.SEA - PHL
Nonstop5h 12mAlaska Airlines
mar. 18/117:02 a.m.PHL - SEA
Nonstop6h 11mAlaska Airlines
Deal found 12/10C$ 361
sáb. 25/108:43 p.m.SEA - PHL
1 stop29h 36mFrontier
lun. 3/116:19 a.m.PHL - SEA
1 stop9h 44mFrontier
Deal found 13/10C$ 368
jue. 4/127:00 a.m.SEA - PHL
1 stop7h 39mUnited Airlines
mar. 9/1212:45 p.m.PHL - SEA
1 stop9h 37mUnited Airlines
Deal found 14/10C$ 382
mié. 5/1111:55 p.m.SEA - PHL
1 stop8h 01mDelta
mié. 12/116:01 p.m.PHL - SEA
1 stop8h 58mDelta
Deal found 14/10C$ 389
mar. 11/1111:34 p.m.SEA - PHL
1 stop7h 50mUnited Airlines
mar. 18/1110:34 a.m.PHL - SEA
2 stops10h 51mUnited Airlines
Deal found 14/10C$ 396
sáb. 6/126:00 a.m.SEA - PHL
2 stops11h 35mSouthwest
lun. 8/121:50 p.m.PHL - SEA
2 stops12h 05mSouthwest
Deal found 14/10C$ 413
lun. 17/1111:30 p.m.SEA - PHL
1 stop7h 54mUnited Airlines
jue. 20/113:48 p.m.PHL - SEA
1 stop8h 25mUnited Airlines
Deal found 13/10C$ 414
mié. 17/125:25 a.m.SEA - PHL
1 stop9h 15mDelta
mar. 20/17:00 a.m.PHL - SEA
1 stop11h 08mDelta
Deal found 13/10C$ 417
vie. 7/119:30 p.m.SEA - PHL
Nonstop5h 12mAlaska Airlines
sáb. 15/117:12 p.m.PHL - SEA
Nonstop6h 18mAlaska Airlines
Deal found 13/10C$ 431
mar. 11/116:35 a.m.SEA - PHL
1 stop11h 25mSouthwest
mar. 18/112:45 p.m.PHL - SEA
2 stops11h 10mSouthwest
Deal found 12/10C$ 433
mié. 19/1112:35 p.m.SEA - PHL
1 stop7h 28mUnited Airlines
vie. 28/116:00 a.m.PHL - SEA
1 stop8h 30mUnited Airlines
Deal found 14/10C$ 435

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 14 octubre 2025.

Round-trip from

C$ 361

One-way from

C$ 209

Popular in

December

Cheapest in

October

Average price

C$ 507

Good one-way deal

C$ 194 or less
Alaska Airlines
  • Alaska Airlines
  • 11/11-18/11
  • Nonstop
  • 11h 23m total
  • Seattle to Philadelphia
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 10/11
  • Nonstop
  • 5h 12m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 80 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 October 2025
Search Deals
Price to beat on a one-way 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 14 octubre 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

jue. 13/11

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

Nonstop5h 12m

Philadelphia

lun. 17/11

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

Nonstop6h 18m

C$ 361

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 4/12

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

1 stop7h 39m

Philadelphia

mar. 9/12

12:45 p.m.-7:22 p.m.

1 stop9h 37m

C$ 382

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 5/11

7:10 a.m.-5:38 p.m.

1 stop7h 28m

Philadelphia

mié. 19/11

12:22 p.m.-6:40 p.m.

1 stop9h 18m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

lun. 3/11

11:10 p.m.-9:30 a.m.

1 stop7h 20m

Philadelphia

mar. 11/11

6:59 p.m.-12:01 a.m.

1 stop8h 02m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 11/12

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

1 stop9h 15m

Philadelphia

mar. 16/12

6:07 p.m.-11:58 p.m.

1 stop8h 51m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

vie. 14/11

11:55 p.m.-10:51 a.m.

1 stop7h 56m

Philadelphia

dom. 16/11

6:14 a.m.-10:54 a.m.

1 stop7h 40m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 5/11

7:10 a.m.-5:38 p.m.

1 stop7h 28m

Philadelphia

mié. 12/11

6:01 p.m.-11:59 p.m.

1 stop8h 58m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 20/11

7:12 p.m.-5:55 a.m.

1 stop7h 43m

Philadelphia

jue. 27/11

7:10 a.m.-2:59 p.m.

1 stop10h 49m

C$ 389

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

lun. 3/11

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

Nonstop5h 12m

Philadelphia

vie. 7/11

7:02 a.m.-10:13 a.m.

Nonstop6h 11m

C$ 417

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mié. 19/11

12:35 p.m.-11:03 p.m.

1 stop7h 28m

Philadelphia

vie. 28/11

6:00 a.m.-11:30 a.m.

1 stop8h 30m

C$ 435

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 20 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 10 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$ 306). 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 14 octubre 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$ 361, Alaska Airlines can have you in Philadelphia from Seattle in 5h 12m. 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: Qatar Airways (83%), British Airways (83%), American Airlines( 79%).

  • 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$ 259, our data indicates the cheapest price to be C$ 194. 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, 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$ 306). 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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