Cheap flights from Philadelphia to Seattle

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Compare Philadelphia to Seattle flight deals

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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? If you want to travel next month, round-trip fares start from $177. Find the lowest prices on one-way and round-trip tickets right here.

Seattle.$160 per passenger.Departing Tue, Sep 15, returning Mon, Sep 21.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Tue, Sep 15, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departing from Seattle / Tacoma International on Mon, Sep 21, arriving in Philadelphia International.Price includes taxes and charges.From $160, select.

Seattle.$160 per passenger.Departing Tue, Aug 25, returning Wed, Sep 16.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Tue, Aug 25, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departing from Seattle / Tacoma International on Wed, Sep 16, arriving in Philadelphia International.Price includes taxes and charges.From $160, select.

Seattle.$177 per passenger.Departing Tue, Sep 22, returning Fri, Oct 9.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Tue, Sep 22, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departing from Seattle / Tacoma International on Fri, Oct 9, arriving in Philadelphia International.Price includes taxes and charges.From $177, select.

Seattle.$177 per passenger.Departing Mon, Aug 17, returning Wed, Aug 19.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Mon, Aug 17, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departing from Seattle / Tacoma International on Wed, Aug 19, arriving in Philadelphia International.Price includes taxes and charges.From $177, select.

Seattle.$229 per passenger.Departing Sat, Nov 7, returning Mon, Nov 9.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Philadelphia International on Sat, Nov 7, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departing from Seattle / Tacoma International on Mon, Nov 9, arriving in Philadelphia International.Price includes taxes and charges.From $229, select.

Seattle.$229 per passenger.Departing Thu, Oct 1, returning Sat, Oct 10.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Philadelphia International on Thu, Oct 1, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departing from Seattle / Tacoma International on Sat, Oct 10, arriving in Philadelphia International.Price includes taxes and charges.From $229, select.

Seattle.$257 per passenger.Departing Wed, Jul 29, returning Thu, Aug 6.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Wed, Jul 29, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departing from Seattle / Tacoma International on Thu, Aug 6, arriving in Philadelphia International.Price includes taxes and charges.From $257, select.

Seattle.$258 per passenger.Departing Wed, Jul 22, returning Wed, Sep 9.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Wed, Jul 22, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departing from Seattle / Tacoma International on Wed, Sep 9, arriving in Philadelphia International.Price includes taxes and charges.From $258, select.

Seattle.$259 per passenger.Departing Fri, Dec 4, returning Mon, Dec 7.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Philadelphia International on Fri, Dec 4, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departing from Seattle / Tacoma International on Mon, Dec 7, arriving in Philadelphia International.Price includes taxes and charges.From $259, select.

Seattle.$266 per passenger.Departing Tue, Jul 21, returning Wed, Jul 29.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Philadelphia International on Tue, Jul 21, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departing from Seattle / Tacoma International on Wed, Jul 29, arriving in Philadelphia International.Price includes taxes and charges.From $266, select.

Seattle.$289 per passenger.Departing Thu, Oct 29, returning Sun, Nov 1.Round-trip flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departing from Philadelphia International on Thu, Oct 29, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departing from Seattle / Tacoma International on Sun, Nov 1, arriving in Philadelphia International.Price includes taxes and charges.From $289, select.

Seattle.$309 per passenger.Departing Sat, Mar 6, returning Sat, Apr 17.Round-trip flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departing from Philadelphia International on Sat, Mar 6, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departing from Seattle / Tacoma International on Sat, Apr 17, arriving in Philadelphia International.Price includes taxes and charges.From $309, select.

Seattle.$309 per passenger.Departing Fri, Sep 4, returning Wed, Sep 9.Round-trip flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departing from Philadelphia International on Fri, Sep 4, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departing from Seattle / Tacoma International on Wed, Sep 9, arriving in Philadelphia International.Price includes taxes and charges.From $309, select.

Seattle.$309 per passenger.Departing Fri, Dec 4, returning Sun, Dec 6.Round-trip flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departing from Philadelphia International on Fri, Dec 4, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departing from Seattle / Tacoma International on Sun, Dec 6, arriving in Philadelphia International.Price includes taxes and charges.From $309, select.

Seattle.$309 per passenger.Departing Sat, Aug 29, returning Tue, Sep 1.Round-trip flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departing from Philadelphia International on Sat, Aug 29, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departing from Seattle / Tacoma International on Tue, Sep 1, arriving in Philadelphia International.Price includes taxes and charges.From $309, select.

Seattle.$309 per passenger.Departing Fri, May 21, returning Sun, May 30.Round-trip flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departing from Philadelphia International on Fri, May 21, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departing from Seattle / Tacoma International on Sun, May 30, arriving in Philadelphia International.Price includes taxes and charges.From $309, select.

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 September.

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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	$160
Cheapest month to fly	September
Average flight time	5 hrs, 58 mins
Most popular airline	Qatar Airways
Average flights per week	69

Finding cheap flights from Philadelphia to Seattle: Frequently asked questions

How many airports are there in Seattle?

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.

How much are round-trip flights from Philadelphia to Seattle?

The best price we found for a round-trip flight from Philadelphia to Seattle is $160. 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.

How long does it take to fly from Philadelphia to Seattle?

5 hours and 58 minutes is the average flight time from Philadelphia to Seattle.

Which airlines fly direct from Philadelphia to Seattle?

Qatar Airways, American Airlines and Alaska Airlines fly direct from Philadelphia to Seattle.

How many flights are there a week from Philadelphia to Seattle?

There are 69 flights per week flying from Philadelphia to Seattle, as of July 2026.

When is the cheapest time to fly from Philadelphia to Seattle?

The cheapest month to fly from Philadelphia to Seattle is usually September.

What's the cheapest airport to fly to in Seattle?

If you're flying from Philadelphia, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the center of Seattle. We've found flights to this airport from $160.

Which upcoming date is cheapest to fly from Philadelphia to Seattle on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Philadelphia to Seattle on Tuesday, September 15, 2026.

Can I get a direct flight from Philadelphia to Seattle?

Yes – the average flight time is 5 hours and 58 minutes.

How can I get the best flight deal from Philadelphia to Seattle?

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.

When is the best time to book flights to Seattle?

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.

What’s the weather like in Seattle?

In July, the average temperature is usually around 17°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.

Which is the cheapest airline to fly with from Philadelphia to Seattle?

The cheapest airline that flies to Seattle is Frontier 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

Begin planning your trip by checking out the ideal departure point for your flight from Philadelphia to Seattle. Explore the options for taking off from Philadelphia International Airport (PHL) or Philadelphia Trenton-Mercer Airport (TTN), two of the city's main airports.
Seattle / Tacoma International Airport (SEA) and Paine Field Airport (PAE) are the major entry points to Seattle.
The average length of a direct Philadelphia to Seattle flight is 6 hours 10 minutes.
Seattle's timezone is UTC-8, making Seattle three hours behind Philadelphia.
The most popular route for flights from Philadelphia to Seattle is Philadelphia International Airport (PHL) to Seattle / Tacoma International Airport (SEA). Pick from 32 services that connect these two airports each week.
For a smooth journey, arrive at the airport two hours ahead of international flights and one hour before domestic departures. That way, you can comfortably board your Philadelphia to Seattle flight.
Traveling during a peak time like August? Major public holidays and other popular seasons can mean longer lines at security. Play things extra safe and arrive up to four hours before an international flight and two hours before domestic departures.

How to find the cheapest flights from Philadelphia to Seattle

Don't wait until the last moment. You're more likely to find cheap Philadelphia to Seattle flights if you book in advance. Airlines often offer some amazing early bird deals.
If you're willing to be flexible with your trip dates, try using the 'Whole month' tool. It'll show you the lowest price in each month when looking for your plane ticket from Philadelphia to Seattle.
There's no need to check back in every day to see if prices have dropped when you set up a Price Alert. We'll notify you the moment a better deal comes up on cheap flights from Philadelphia to Seattle.
Pick your ideal arrival and departure times, airlines and number of stops by using the filters. Alternatively, sort your Philadelphia to Seattle flight results by 'Cheapest,' 'Fastest' or 'Best.'

Flying from Philadelphia

Philadelphia International Airport (PHL)

You can get a direct flight from Philadelphia to Seattle taking off from Philadelphia International Airport (PHL). Begin your trip at PHL and come in for landing at Seattle / Tacoma International Airport (SEA).
You'll find a variety of airlines offering direct Philadelphia to Seattle plane tickets with departures from PHL, including:
Traveling from central Philadelphia to PHL takes about 30 minutes on public transport. If you drive, ride-share or take a cab, you'll cover the 11 kilometers in 20 minutes or so, depending on traffic.
In search of a convenient hotel close to Philadelphia International Airport? If you've booked an early flight from Philadelphia to Seattle, these stays will put you moments from your departure gate:
When it comes to Philadelphia International Airport's on-time performance, data shows 77% of flights stick to their scheduled arrival time.
The address for PHL is 8500 Essington Ave.

Arriving in Seattle

Seattle / Tacoma International Airport (SEA)

Seattle / Tacoma International Airport (SEA) is approximately 19 kilometers from central Seattle. If you're catching a cab or a ride-share, the drive takes roughly 25 minutes.
It typically takes 35 minutes to get there on public transport.
Book a hotel near SEA if you're coming in on a late flight from Philadelphia to Seattle. Check in to one of these accommodation options and avoid the hassle of a long transfer:
Go where the road takes you with a Seattle / Tacoma International Airport rental car. Pick up your wheels from Thrifty, Europcar or Budget and chase adventure across Seattle and beyond.
Lock in the lowest price by booking your vehicle from Seattle / Tacoma International Airport around one week before your departure date.

Paine Field Airport (PAE)

Once your flight from Philadelphia to Seattle has hit the tarmac, you can reach the city center in around 20 minutes by car. Central Seattle is approximately 32 kilometers from Paine Field Airport (PAE).
If you hop on public transport, you'll reach the center in 40 minutes or so.
After your flight from Philadelphia to Seattle, settle in at a hotel close to PAE. These are some great options that'll help you switch to relaxation mode:
Grab a Paine Field Airport rental car and be in control of your journey. You can select from trusted outlets like Budget and Enterprise.
Get the vehicle you actually want, not just what's left, by securing your ride from PAE ahead of your arrival. You'll also avoid paying more than you need to, especially during peak travel times.

Seattle Boeing Fld Airport (BFI)

Seattle Boeing Fld Airport (BFI) is around 11 kilometers from the center of Seattle. It takes about 20 minutes to reach the city center by car once you've stepped off your flight from Philadelphia to Seattle.
The journey takes about 35 minutes when traveling on public transport.
Stay in control of the next leg of your journey with a Seattle Boeing Fld Airport rental car. Alamo, Budget and Avis are dependable companies for booking.
Booking a couple of weeks ahead of your flight from Philadelphia to Seattle is smart. As well as better prices, you might find it easier to get the make and model you prefer at BFI.

Best time to go to Seattle

July is the busiest month for flights from Philadelphia to Seattle. To skip the crowds, visit Seattle in March.
Book a Philadelphia to Seattle ticket departing in August if you want to visit the city during its warmest month. Expect temperatures in Seattle to range from 12ºC (54ºF) to 28ºC (82ºF).
February has average temperatures of between -1ºC (30ºF) and 11ºC (52ºF). Look for cheap flights from Philadelphia to Seattle around that time if you want to travel in cooler conditions.

More about Seattle

Start your Seattle trip right by choosing the perfect place to stay. As soon as you've booked your flight from Philadelphia to Seattle, browse our range of accommodation options including:
Space Needle and Pike Place Fish Market are just the start of the top-rated attractions to add to your Seattle travel itinerary. Keep the momentum going by heading to The Museum of Flight.

Explore more of the United States

Seattle has its own special appeal, but there are so many other corners of the United States waiting to be discovered. Around 241 kilometers south of Seattle, a visit to Portland will keep you busy. Check out popular attractions like Portland Japanese Garden, Peninsula Park Rose Garden and International Rose Test Garden.
Spokane is another standout destination in the United States and is around 370 kilometers east of Seattle. No journey is complete without experiencing Riverside State Park, Spokane Falls (Upper Falls) and Cathedral of Our Lady of Lourdes.