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Cheap flights from Philadelphia to Seattle from C$ 268

PHL — SEA
29 Oct — 5 Nov1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Philadelphia to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Philadelphia to Seattle

Thu 29/105:20 a.m. -
2 stops11h 10m
Sun 1/1112:15 a.m. -
1 stop7h 45m
Deal found 27/9C$ 513
Wed 21/101:20 p.m. -
2 stops12h 20m
Sat 24/105:25 a.m. -
2 stops12h 35m
Deal found 28/9C$ 520
Thu 19/112:45 p.m. -
2 stops11h 05m
Mon 23/115:30 a.m. -
1 stop10h 15m
Deal found 28/9C$ 521
Mon 19/105:08 p.m. -
1 stop8h 45m
Mon 26/1010:56 p.m. -
1 stop7h 56m
Deal found 27/9C$ 527
Tue 3/116:15 a.m. -
1 stop9h 04m
Tue 3/117:35 p.m. -
2 stops13h 02m
Deal found 25/9C$ 528
Fri 11/126:25 p.m. -
1 stop9h 05m
Mon 14/126:30 a.m. -
1 stop11h 50m
Deal found 27/9C$ 534
Fri 23/105:10 p.m. -
2 stops10h 50m
Mon 26/109:15 p.m. -
2 stops10h 25m
Deal found 25/9C$ 541
Fri 6/111:50 p.m. -
1 stop13h 55m
Wed 11/115:40 a.m. -
2 stops12h 45m
Deal found 25/9C$ 542
Fri 23/105:50 a.m. -
1 stop12h 22m
Sun 25/109:19 a.m. -
Nonstop5h 19m
Deal found 25/9C$ 547
Thu 5/116:21 p.m. -
1 stop9h 38m
Sun 8/1110:56 p.m. -
1 stop7h 56m
Deal found 29/9C$ 548
Tue 17/119:45 a.m. -
1 stop8h 47m
Sat 21/1110:56 p.m. -
1 stop7h 49m
Deal found 25/9C$ 550
Thu 29/1012:35 p.m. -
2 stops10h 30m
Sun 1/119:10 a.m. -
1 stop7h 15m
Deal found 28/9C$ 555

Find flight deals from Philadelphia to Seattle

Round-trip from

C$ 513

One-way from

C$ 268

Popular in

August

Cheapest in

January

Average price

C$ 575

Good one-way deal

C$ 194 or less
Southwest
  • Southwest
  • 29/10-4/11
  • 3 total stops
  • 17h 35m total
  • Philadelphia to Seattle
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United Airlines
  • United Airlines
  • 5/1-31/12
  • 1 total stop
  • 8h 40m total
  • Philadelphia to Seattle
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Highest demand for flights based on searches. 9% potential increase in price (C$ 86 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Price to beat on a one-way flight from Philadelphia to Seattle/Tacoma Intl.
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Philadelphia to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Sat 27/2

1:15 p.m.-10:40 p.m.

2 stops12h 25m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 282

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Mon 23/11

6:00 a.m.-1:54 p.m.

2 stops10h 54m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 282

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Fri 4/12

9:20 a.m.-4:22 p.m.

1 stop10h 02m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 283

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Sun 8/11

6:15 a.m.-12:19 p.m.

1 stop9h 04m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 296

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Sun 15/11

7:00 a.m.-10:05 a.m.

Nonstop6h 05m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 324

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Mon 23/11

7:00 a.m.-10:05 a.m.

Nonstop6h 05m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 324

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Mon 22/3

7:00 a.m.-10:09 a.m.

Nonstop6h 09m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 326

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Sat 27/3

9:30 a.m.-3:54 p.m.

1 stop9h 24m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 333

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Thu 26/11

6:00 a.m.-4:19 p.m.

2 stops13h 19m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 353
Quickest round-trip

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Fri 23/10

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

Nonstop5h 58m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 360

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/9

Showing 1-10 of 24 resultsSorted by cheapest first
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Best time to book a flight from Philadelphia to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Philadelphia with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to Seattle

How far ahead should I book a flight from Philadelphia to Seattle?

To ensure you get the cheapest price possible for a flight from Philadelphia to Seattle, you should look to book at least 70 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Philadelphia to Seattle?

Currently, January is the cheapest month in which you can book a flight from Philadelphia to Seattle (average of C$ 476). Flying from Philadelphia to Seattle in August is currently the most expensive (average of C$ 666). 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 PHL to SEA?

When flying from Philadelphia to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Airfare is typical for this route at the moment.

Philadelphia to Seattle flights typically cost between C$ 480 and C$ 681 in October.
The cheapest round-trip price found within the last 5 days was C$ 513 on Southwest (29 Oct-4 Nov).

Related info for your journey

  • How popular is this Philadelphia to Seattle flight route?

    This flight path from Philadelphia to Seattle/Tacoma Intl was viewed by 1 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 Philadelphia to Seattle?

    Departing from Philadelphia to Seattle will take you 6h 10m. The distance from Philadelphia to Seattle is about 3814 km. This flight may include one or multiple stops.

  • What are the most reliable airlines from Philadelphia to Seattle?

    The top 3 most reliable airlines when flying from Philadelphia to Seattle are Finnair (83%), Alaska Airlines (67%) and Delta (62%).

  • Can I find deals for flights from Philadelphia to Seattle that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Seattle.

  • Can I find deals for business class flights from Philadelphia to Seattle?

    Yes. Cheapflights offers flight deals from Philadelphia to Seattle 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 Philadelphia to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Philadelphia to Seattle (average of C$ 476). Flying from Philadelphia to Seattle in August is currently the most expensive (average of C$ 666). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Kent
Mukilteo
Renton
Cashmere
Lynnwood
Ellensburg
Leavenworth
Tukwila
Tacoma
Marysville
Federal Way
Kirkland

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Philadelphia to Seattle

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John F Kennedy Intl to Seattle flights
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Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Seattle from Philadelphia today and book when prices fit your budget.

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