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Cheap flights from Seattle to Philadelphia from C$ 231

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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
17 Aug — 24 Aug1
1 adult
1 adult, Economy, 0 bags

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 July 2026.

Thu 22/109:25 p.m.
SEA
-
PHL
Nonstop5h 15m
Alaska Airlines
Sun 1/117:00 a.m.
PHL
-
SEA
Nonstop6h 08m
Alaska Airlines
Deal found 14/7C$ 461
Wed 14/1012:10 a.m.
SEA
-
PHL
1 stop7h 40m
Southwest
Sun 18/106:45 a.m.
PHL
-
SEA
1 stop8h 50m
Southwest
Deal found 13/7C$ 463
Thu 13/87:06 p.m.
SEA
-
PHL
1 stop7h 33m
Frontier
Wed 19/84:45 p.m.
PHL
-
SEA
2 stops19h 34m
Frontier
Deal found 17/7C$ 464
Thu 27/87:00 a.m.
SEA
-
PHL
2 stops11h 05m
Southwest
Mon 31/82:05 p.m.
PHL
-
SEA
2 stops9h 40m
Southwest
Deal found 15/7C$ 468
Thu 24/910:50 a.m.
SEA
-
PHL
1 stop7h 50m
Southwest
Sun 27/96:20 a.m.
PHL
-
SEA
2 stops10h 20m
Southwest
Deal found 14/7C$ 470
Tue 4/88:13 p.m.
SEA
-
PHL
1 stop30h 47m
Frontier
Wed 12/811:06 a.m.
PHL
-
SEA
1 stop26h 58m
Frontier
Deal found 15/7C$ 471
Mon 2/1111:03 p.m.
SEA
-
PHL
1 stop8h 15m
United Airlines
Sat 7/115:01 p.m.
PHL
-
SEA
1 stop8h 52m
United Airlines
Deal found 17/7C$ 473
Tue 11/88:13 p.m.
SEA
-
PHL
2 stops13h 09m
Frontier
Sun 23/88:37 p.m.
PHL
-
SEA
1 stop15h 42m
Frontier
Deal found 17/7C$ 474
Thu 22/107:59 p.m.
SEA
-
PHL
1 stop7h 06m
Delta
Thu 29/107:00 a.m.
PHL
-
SEA
Nonstop5h 58m
Delta
Deal found 14/7C$ 475
Fri 21/87:00 a.m.
SEA
-
PHL
2 stops11h 05m
Southwest
Mon 24/85:25 a.m.
PHL
-
SEA
2 stops10h 25m
Southwest
Deal found 13/7C$ 477
Tue 11/88:13 p.m.
SEA
-
PHL
2 stops13h 09m
Frontier
Fri 21/88:37 p.m.
PHL
-
SEA
1 stop15h 42m
Frontier
Deal found 17/7C$ 478
Fri 7/87:06 p.m.
SEA
-
PHL
2 stops21h 14m
Frontier
Mon 24/88:37 p.m.
PHL
-
SEA
1 stop15h 42m
Frontier
Deal found 17/7C$ 480

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 July 2026.

Round-trip from

C$ 461

One-way from

C$ 231

Popular in

December

Cheapest in

October

Average price

C$ 585

Good round-trip deal

C$ 461 or less
Alaska Airlines
  • Alaska Airlines
  • 1/9-15/9
  • Nonstop
  • 11h 05m total
  • Seattle to Philadelphia
Search Deals
Delta
  • Delta
  • 14/9
  • Nonstop
  • 5h 20m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 6 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip 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 July 2026.
Use the filters below to find and compare flights from Seattle to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

9:25 p.m.-5:33 a.m.

Nonstop5h 08m

Philadelphia

Sun 15/11

7:00 a.m.-10:08 a.m.

Nonstop6h 08m

C$ 461

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 10/11

9:25 p.m.-5:33 a.m.

Nonstop5h 08m

Philadelphia

Sat 14/11

5:49 p.m.-8:59 p.m.

Nonstop6h 10m

C$ 461

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 14/10

12:10 a.m.-10:50 a.m.

1 stop7h 40m

Philadelphia

Sun 18/10

6:45 a.m.-12:35 p.m.

1 stop8h 50m

C$ 463

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

5:30 a.m.-6:45 p.m.

1 stop10h 15m

Philadelphia

Sun 15/11

7:30 a.m.-1:15 p.m.

1 stop8h 45m

C$ 470

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 2/11

11:45 a.m.-11:12 p.m.

1 stop8h 27m

Philadelphia

Fri 6/11

7:00 a.m.-9:58 a.m.

Nonstop5h 58m

C$ 475

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

9:50 p.m.-6:03 a.m.

Nonstop5h 13m

Philadelphia

Sun 15/11

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

1 stop7h 40m

C$ 475

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 2/11

10:45 a.m.-12:05 a.m.

2 stops10h 20m

Philadelphia

Fri 6/11

6:25 p.m.-12:30 a.m.

1 stop9h 05m

C$ 488

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 20/10

10:35 p.m.-11:00 a.m.

1 stop9h 25m

Philadelphia

Sat 7/11

5:23 p.m.-10:05 p.m.

1 stop7h 42m

C$ 489

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 21/8

7:00 a.m.-9:05 p.m.

2 stops11h 05m

Philadelphia

Mon 24/8

2:05 p.m.-8:45 p.m.

2 stops9h 40m

C$ 510
Cheapest one-way

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 10/10

9:31 p.m.-5:45 a.m.

Nonstop5h 14m

C$ 231

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/7

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

The best time to book flights from Seattle to Philadelphia is 80 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, October is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 461). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 728). 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 July 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Philadelphia as you normally would.

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

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Philadelphia. Reviews last updated 18 July 2026.
Get a feel of what it's like to fly with Alaska Airlines from Seattle to Philadelphia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,672 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.0

Boarding

8.1

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
Alaska Airlines
7.9
Good
12,672 reviews
Alaska Airlines
7.9
Good
12,672 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.0

Boarding

8.1

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

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.

  • What airports do I use to fly from Seattle to Philadelphia?

    If you book a flight from Seattle to Philadelphia, you will be flying from Seattle/Tacoma Intl to Philadelphia. Flights to Philadelphia (PHL) from Seattle/Tacoma Intl (SEA) take 5h 11m for a nonstop flight. There are 7 flights from Seattle/Tacoma Intl to Philadelphia per day from 1 airline.

  • How popular is this Seattle to Philadelphia flight route?

    This flight path from Seattle/Tacoma Intl to Philadelphia was viewed by 8 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$ 461, Alaska Airlines can have you in Philadelphia from Seattle in 5h 08m. Seattle and Philadelphia are separated by a distance of 3814 km. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Seattle to Philadelphia round-trip?

    Our cheapest airline available from Seattle to Philadelphia is Alaska Airlines. Our recent data shows that you can find tickets from as low as C$ 285 on this airline. Alaska Airlines is currently priced 50% below the average price you’ll pay for this route.

  • 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: KLM (100%), STARLUX Airlines (93%), Finnair( 86%).

  • 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$ 543, our data indicates the cheapest price to be C$ 461. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 609.

  • 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, October is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 461). Flying from Seattle to Philadelphia in December is currently the most expensive (average of C$ 728). 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
Voorhees
Reading
King of Prussia
Wildwood
West Chester

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Seattle to Philadelphia

Discover the top airline that operate flights from Seattle to Philadelphia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 18 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapestC$ 285AverageC$ 543FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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.

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