Cheap Flights from Philadelphia (PHL) to Seattle (SEA)

View AU$241 flight on Fri, 3 Oct. 2025Opens in a new window

Popular airlines from Philadelphia International Airport (PHL) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Philadelphia (PHL) to Seattle (SEA)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$429 Return, found 4 days ago
AU$429
Return
found 4 days ago
Select Alaska Airlines flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$429 found 4 days ago
Alaska Airlines
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$446 Return, found 4 days ago
AU$446
Return
found 4 days ago
Select Alaska Airlines flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$446 found 4 days ago
Delta
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$447 Return, found 4 days ago
AU$447
Return
found 4 days ago
Select Delta flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$447 found 4 days ago
Delta
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$492 Return, found 4 days ago
AU$492
Return
found 4 days ago
Select Delta flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$492 found 4 days ago
Delta
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$494 Return, found 4 days ago
AU$494
Return
found 4 days ago
Select Delta flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$494 found 4 days ago
Alaska Airlines
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$499 Return, found 4 days ago
AU$499
Return
found 4 days ago
Select Alaska Airlines flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$499 found 4 days ago
American Airlines
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$506 Return, found 4 days ago
AU$506
Return
found 4 days ago
Select American Airlines flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$506 found 4 days ago
Alaska Airlines
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$516 Return, found 4 days ago
AU$516
Return
found 4 days ago
Select Alaska Airlines flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$516 found 4 days ago
Alaska Airlines
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$523 Return, found 4 days ago
AU$523
Return
found 4 days ago
Select Alaska Airlines flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$523 found 4 days ago
United
Sat, 30 Aug. - Fri, 5 Sep.
PHL
Philadelphia
SEA
Seattle
AU$565 Return, found 4 days ago
AU$565
Return
found 4 days ago
Select United flight, departing Sat, 30 Aug. from Philadelphia to Seattle, returning Fri, 5 Sep., priced at AU$565 found 4 days ago

Find the cheapest month to fly from Philadelphia (PHL) to Seattle (SEA)

September is typically the cheapest month to fly

From AU$204 - AU$422 per traveller.

Graph displaying average flight prices per month

Flight from Philadelphia to Seattle route information
Origin airport
Philadelphia Intl.
Destination airport
Seattle - Tacoma Intl.
Return price
AU$428
Distance
3794 km
Average flight time
3 hours 41 mins

Your quick guide to flights from Philadelphia to Seattle

Pick up great flights from Philadelphia to Seattle

With Expedia, you have your pick of 10 flights a day with 20 airlines covering flights from Philadelphia to Seattle. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from Philadelphia to Seattle that take around 5 hours.

Find cheap flights from Philadelphia to Seattle

From the great flight deals with prices currently ranging from AU$429 to AU$565, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from Philadelphia to Seattle around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to Seattle is normally in August.

Reasons to book your flight from Philadelphia to Seattle with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from Philadelphia to Seattle across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to Seattle right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Frequently asked questions

How much is a flight from Philadelphia Intl. Airport (PHL) to SEA?
If you're planning on travelling from Philadelphia Intl. Airport (PHL) to Seattle - Tacoma Intl. Airport (SEA), round-trip flights start from AU$429. This figure is based on airfares available within the last 7 days on Expedia for flights departing within the next year, so don't hang about. Book now and save yourself both money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Philadelphia Intl. Airport (PHL) to Sea-Tac Airport?
We understand that circumstances change unexpectedly, so we've made it as simple as possible for you to cancel your flight online. Just visit the Customer Service Portal and follow the instructions.
How do I find cheap flights from Philadelphia Airport to Sea-Tac Airport that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for PHL to SEA flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Philadelphia Intl. Airport (PHL) to Sea-Tac Airport?
The flying distance between PHL and SEA is 3 800 kilometres. Sneak in a nap or make a start on the latest bestseller and the journey will zip by.
Which airlines fly direct from Philadelphia Intl. Airport (PHL) to Sea-Tac Airport?
There are a few airlines that fly from PHL to Seattle - Tacoma Intl. Airport (SEA). Alaska Airlines (AS) is a great choice, offering 30 flights every month. Operating 30 flights each month on this route, American Airlines (AA) is another traveller favourite.
Are PHL to Seattle - Tacoma Intl. Airport (SEA) flight tickets cheaper when they're purchased at the last minute?
Last-minute bookings from PHL to Seattle - Tacoma Intl. Airport (SEA) can be hit-or-miss. You may be able to score a great bargain, but then again, you could miss out! If you'd rather play it safe and start planning your trip early on, Expedia compares flight deals up to 12 months in advance. Just keep in mind that not all airlines publish their prices that far in advance. Our suggestion? Check back often as prices are updated regularly.

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