Find flights
Deals
When to book
FAQs

Cheap flights from Philadelphia to Seattle from C$ 328

PHL — SEA
14 Dec — 21 Dec1
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

Wed 9/127:00 a.m. -
Nonstop6h 28m
Sat 12/129:05 a.m. -
Nonstop5h 03m
Deal found 9/11C$ 580
Fri 25/127:02 a.m. -
Nonstop6h 27m
Tue 29/129:33 p.m. -
Nonstop5h 09m
Deal found 10/11C$ 582
Tue 22/127:02 a.m. -
Nonstop6h 27m
Fri 1/19:18 a.m. -
Nonstop5h 07m
Deal found 10/11C$ 583
Wed 16/127:00 a.m. -
Nonstop6h 28m
Sat 26/129:33 p.m. -
Nonstop5h 09m
Deal found 12/11C$ 595
Wed 16/127:00 a.m. -
Nonstop6h 28m
Sun 27/129:33 p.m. -
Nonstop5h 09m
Deal found 12/11C$ 596
Mon 14/126:11 p.m. -
Nonstop6h 42m
Mon 28/129:33 p.m. -
Nonstop5h 09m
Deal found 12/11C$ 597
Mon 14/126:24 a.m. -
1 stop8h 20m
Thu 17/127:10 p.m. -
1 stop7h 21m
Deal found 9/11C$ 602
Sat 5/129:20 a.m. -
1 stop10h 03m
Wed 9/128:30 a.m. -
1 stop8h 01m
Deal found 9/11C$ 603
Sat 5/129:20 a.m. -
1 stop10h 03m
Tue 8/1210:48 a.m. -
1 stop7h 51m
Deal found 9/11C$ 605
Fri 18/123:39 p.m. -
1 stop11h 16m
Sun 17/18:00 a.m. -
1 stop8h 57m
Deal found 10/11C$ 609
Tue 8/129:20 a.m. -
1 stop10h 02m
Tue 15/127:00 a.m. -
1 stop7h 57m
Deal found 10/11C$ 610
Thu 10/129:20 a.m. -
1 stop10h 02m
Thu 17/1211:44 p.m. -
1 stop7h 51m
Deal found 10/11C$ 613

Find flight deals from Philadelphia to Seattle

Round-trip from

C$ 580

One-way from

C$ 328

Popular in

August

Cheapest in

February

Average price

C$ 650

Good one-way deal

C$ 176 or less
Alaska Airlines
  • Alaska Airlines
  • 26/2-7/3
  • Nonstop
  • 11h 19m total
  • Philadelphia to Seattle
Search Deals
Southwest
  • Southwest
  • 7/12-31/12
  • 1 total stop
  • 8h 20m total
  • Philadelphia to Seattle
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 69 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2026
Search Deals
Price to beat on a one-way flight from Philadelphia to Seattle/Tacoma Intl.
Search Deals

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

Fri 23/4

7:40 a.m.-5:55 p.m.

2 stops13h 15m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 356

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Sun 20/12

12:25 p.m.-10:53 p.m.

1 stop13h 28m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 368

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Wed 25/11

12:10 p.m.-8:00 p.m.

2 stops10h 50m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 375

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Fri 4/12

7:30 a.m.-4:00 p.m.

2 stops11h 30m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 378

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Tue 24/11

2:15 p.m.-1:20 a.m.

1 stop14h 05m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 382
Quickest round-trip

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Sat 5/12

6:11 p.m.-9:53 p.m.

Nonstop6h 42m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 384

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Tue 22/12

2:15 p.m.-11:10 p.m.

2 stops11h 55m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 384

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Mon 4/1

2:30 p.m.-11:05 p.m.

2 stops11h 35m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 384

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Wed 10/3

10:15 a.m.-12:49 a.m.

3 stops17h 34m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 412

PhiladelphiaSeattle

PHL Philadelphia - SEA Seattle/Tacoma Intl

PHLSEA

Philadelphia

Mon 21/12

10:37 a.m.-10:32 p.m.

2 stops14h 55m

Seattle/Tacoma Intl

Wed 31/12

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

Nonstop0h 00m

C$ 442

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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$ 481). Flying from Philadelphia to Seattle in August is currently the most expensive (average of C$ 669). 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$ 566 and C$ 823 in February.
The cheapest round-trip price found within the last 5 days was C$ 580 on Alaska Airlines (26 Feb-7 Mar).

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 14m. 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 American Airlines (88%), Finnair (88%) and British Airways (85%).

  • 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$ 481). Flying from Philadelphia to Seattle in August is currently the most expensive (average of C$ 669). 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
Tukwila
Mukilteo
Ellensburg
Renton
Lynnwood
Cashmere
Tacoma
Marysville
Federal Way
Kirkland
Leavenworth

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Philadelphia to Seattle

Newark to Seattle flights
Reagan-National to Seattle flights
John F Kennedy Intl to Seattle flights

Fly with Cheapflights

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Seattle from Philadelphia today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Philadelphia to Seattle?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Philadelphia to Seattle for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Philadelphia to Seattle with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Philadelphia to Seattle flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Philadelphia to Seattle become cheaper?

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.

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.