Cheap Flights from Philadelphia (PHLA) to Seattle (SEAA)

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Flight deals from Philadelphia to Seattle

Looking for a cheap last-minute deal or the best round-trip flight from Philadelphia to Seattle? Find the lowest prices on one-way and round-trip tickets right here.

Find the cheapest month to fly from Philadelphia to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Philadelphia to Seattle flights are currently cheapest in April.

Direct flights from Philadelphia to Seattle

Alternative Philadelphia to Seattle routes

Looking for the cheapest, fastest or easiest route from Philadelphia to Seattle? You could fly into the following airports instead.

Philadelphia to Seattle: Flight information

The things to know before you go.
Cheapest flight found$80
Cheapest month to flyMay
Average flight time6 hrs, 8 mins
Most popular airlineAir Tahiti Nui
Average flights per week68

Finding cheap flights from Philadelphia to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a round-trip flight from Philadelphia to Seattle is $167. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
6 hours and 8 minutes is the average flight time from Philadelphia to Seattle.
Air Tahiti Nui, American Airlines and Alaska Airlines fly direct from Philadelphia to Seattle.
There are 68 flights per week flying from Philadelphia to Seattle, as of March 2025.
The cheapest month to fly from Philadelphia to Seattle is usually March 2025.
If you're flying from Philadelphia, the cheapest airport near Seattle is Seattle / Tacoma International – which is 12.1 miles away from the center of Seattle. We've found flights to this airport from $167.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Philadelphia to Seattle on Monday, April 7, 2025.
Yes – the average flight time is 6 hours and 8 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In March, the average temperature is usually around 43°F. August is typically the warmest month in Seattle, when it usually averages around 73°F. You can expect the least rain in July. The coldest month is December, with temperatures averaging 33°F. The rainiest month is November.
The cheapest airline that flies to Seattle is Spirit Airlines, and the cheapest airline that flies to Seattle Boeing Fld Airport is Alaska Airlines.

Traveling from Philadelphia to Seattle: what you need to know

  • Countless great adventures start at one of Philadelphia's main airports, Philadelphia International Airport (PHL) or Trenton-Mercer Airport (TTN). Explore your options for booking a flight from Philadelphia to Seattle leaving from either of these.

  • Disembark at Seattle-Tacoma International Airport (SEA). This is the primary arrival point in Seattle.

  • 6 hours 6 minutes is the average journey time for a direct flight from Philadelphia to Seattle. Operating on the UTC-7 timezone, Seattle is 3 hours behind Philadelphia.

  • With 24 flights a week between the two airports, Philadelphia International Airport (PHL) to Seattle-Tacoma International Airport (SEA) is the most popular route. Board the first flight from Philadelphia to Seattle with Alaska Airlines at 07:00. If you'd like to get more out of your day before jetting off, the last departure from PHL to SEA is with American Airlines at 19:16.

  • Leave plenty of time to make your flight from Philadelphia to Seattle. A good rule of thumb is to arrive at least two hours before international departures and an hour ahead for domestic flights.

  • Traveling during a peak period like school or public holidays? Expect longer queues at security and check-in. To play it safe, arrive up to four hours before international flights and two hours ahead of domestic departures.

  • When flying within United States, you won't need a visa or even a passport. However, you'll have to present some kind of identification, like an ID card or driver's license. Once you've booked cheap flights from Philadelphia to Seattle, make sure your ID is up to date.

Flying from Philadelphia

Philadelphia International Airport (PHL)

  • You can reserve a direct flight from Philadelphia to Seattle departing from Philadelphia International Airport (PHL). Begin your journey at PHL and touch down at Seattle-Tacoma International Airport (SEA).

  • You can book a direct flight from Philadelphia to Seattle with American Airlines. This well-known airline operates services from PHL.

  • Consider adding a stopover to potentially save on your flight from Philadelphia to Seattle. Simply uncheck 'Direct flights only' when searching for departures from Philadelphia International Airport. Take a break from traveling at one of these popular airports:

    • Detroit Metropolitan Wayne County Airport (DTW)

    • Minneapolis-St. Paul International Airport (MSP)

    • Pearson International Airport (YYZ)

  • The journey from central Philadelphia to PHL takes around 44 minutes on public transport. If you drive, ride-share or get a cab, you'll cover the 12 miles in 17 minutes or so, depending on traffic.

  • Catching an early flight from Philadelphia to Seattle? Avoid rushing to the terminal (and enjoy a little extra shut-eye) by picking one of these hotels near Philadelphia International Airport:

Arriving in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) to central Seattle is approximately 14 miles. It'll take you about 18 minutes to reach the center driving.

  • When traveling by public transport, expect a journey time of roughly 54 minutes.

  • Reserve a hotel close to SEA if you have a late flight from Philadelphia to Seattle. Settle into one of these options and avoid the hassle of a long transfer:

Lake Union Sea Plane Base Airport (LKE)

How to find the cheapest flights from Philadelphia to Seattle

  • $80 is currently the lowest price for a one-way ticket from Philadelphia to Seattle. Return flights start at $167. These prices can change based on availability.

  • Book 9 months before you travel. After looking at the numbers on our calendar, this is how far you should book ahead to find cheap tickets from Philadelphia to Seattle.

  • Schedule your trip for May. That's the cheapest month for tickets from Philadelphia to Seattle. If you're flexible with your dates, use the 'Whole month' tool to find the cheapest price across every month.

  • Getting a cheap ticket from Philadelphia to Seattle is easy with Price Alerts. All you need to do is set up one of these automatic alerts and we'll notify you when the price has fallen.

  • Use filters to tailor your flights from Philadelphia to Seattle. Enter your ideal arrival and departure times, number of stops and airlines. Or sort your results by 'Cheapest' to see the best deals.

Best time to go to Seattle

  • July is the most popular month for flights from Philadelphia to Seattle. To steer clear of the crowds, head to Seattle in May.

  • The warmest month in Seattle is August, with temperatures ranging between 54ºF and 82ºF. Lock in your flights from Philadelphia to Seattle in this month if you enjoy this type of weather.

  • If you'd rather travel in cooler conditions, lock in a cheap ticket from Philadelphia to Seattle in February when temperatures average between 30ºF and 52ºF.

More about Seattle

Complete your Seattle trip with a car rental

  • Explore our range of car rentals once you've booked your hotel and cheap flight from Philadelphia to Seattle. Whether you're after a compact ride, family sedan or something in between, you can compare companies in one go to find the best deal.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.