Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Philadelphia to Seattle from $91

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to Seattle departing on 5/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.

Find the cheapest flights from Philadelphia to Seattle

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from Philadelphia to Seattle.
 Logo
6:00 pm - 12:10 amPHL-SEA
9h 10m1 stop
 Logo
6:25 am - 5:10 amSEA-PHL
19h 45m1 stop
Wed, May 28 - Wed, Jun 4
 Logo
6:00 pm - 12:10 amPHL-SEA
9h 10m1 stop
 Logo
3:11 pm - 5:38 amSEA-PHL
11h 27m1 stop
Wed, May 28 - Fri, May 30
 Logo
6:00 pm - 12:10 amPHL-SEA
9h 10m1 stop
 Logo
6:25 am - 5:10 amSEA-PHL
19h 45m1 stop
Wed, May 28 - Wed, Jun 4
Frontier Logo
6:15 am - 11:37 pmPHL-SEA
20h 22m1 stop
Frontier Logo
6:25 am - 5:10 amSEA-PHL
19h 45m1 stop
$180Frontier
Find Deal
Tue, Jun 3 - Tue, Jun 10
Frontier Logo
6:15 am - 11:37 pmPHL-SEA
20h 22m1 stop
Frontier Logo
6:25 am - 5:10 amSEA-PHL
19h 45m1 stop
$188Frontier
Find Deal
Tue, Jun 3 - Tue, Jun 10
Delta Logo
6:45 pm - 12:04 amPHL-SEA
8h 19m1 stop
Delta Logo
11:50 pm - 11:49 amSEA-PHL
8h 59m1 stop
$315Delta
Find Deal
Wed, Jul 2 - Mon, Jul 14
Delta Logo
7:05 pm - 11:53 pmPHL-SEA
7h 48m1 stop
Delta Logo
11:35 pm - 11:46 amSEA-PHL
9h 11m1 stop
$322Delta
Find Deal
Wed, Jul 2 - Tue, Jul 8
American Airlines Logo
6:45 pm - 9:50 pmPHL-SEA
6h 05mnonstop
American Airlines Logo
10:59 pm - 7:07 amSEA-PHL
5h 08mnonstop
$327American Airlines
Find Deal
Sat, May 24 - Wed, May 28
United Airlines Logo
9:55 am - 3:52 pmPHL-SEA
8h 57m1 stop
United Airlines Logo
7:00 pm - 5:35 amSEA-PHL
7h 35m1 stop
$338United Airlines
Find Deal
Wed, Aug 20 - Mon, Aug 25
American Airlines Logo
11:04 am - 5:28 pmPHL-SEA
9h 24m1 stop
American Airlines Logo
10:59 pm - 7:07 amSEA-PHL
5h 08mnonstop
$342American Airlines
Find Deal
Wed, May 21 - Wed, May 28

Frontier flights from Philadelphia to Seattle

Our best Frontier deals on Philadelphia to Seattle flight tickets
Frontier
Jun 3
PHL6:15 amPhiladelphia
20h 22m
1 stop
SEA11:37 pmSeattle/Tacoma Intl
Jun 10
SEA6:25 amSeattle/Tacoma Intl
19h 45m
1 stop
PHL5:10 amPhiladelphia
Frontier
May 7
PHL6:54 pmPhiladelphia
26h 06m
1 stop
SEA6:00 pmSeattle/Tacoma Intl
May 10
SEA6:00 amSeattle/Tacoma Intl
12h 15m
1 stop
PHL9:15 pmPhiladelphia
Frontier
Jun 3
PHL6:15 amPhiladelphia
20h 22m
1 stop
SEA11:37 pmSeattle/Tacoma Intl
Jun 10
SEA6:25 amSeattle/Tacoma Intl
19h 45m
1 stop
PHL5:10 amPhiladelphia

Delta flights from Philadelphia to Seattle

Our best Delta deals on Philadelphia to Seattle flight tickets
Delta
Jul 2
PHL6:45 pmPhiladelphia
8h 19m
1 stop
SEA12:04 amSeattle/Tacoma Intl
Jul 14
SEA11:50 pmSeattle/Tacoma Intl
8h 59m
1 stop
PHL11:49 amPhiladelphia
Delta
Jul 2
PHL7:05 pmPhiladelphia
7h 48m
1 stop
SEA11:53 pmSeattle/Tacoma Intl
Jul 8
SEA11:35 pmSeattle/Tacoma Intl
9h 11m
1 stop
PHL11:46 amPhiladelphia
Delta
Aug 30
PHL1:00 pmPhiladelphia
10h 27m
1 stop
SEA8:27 pmSeattle/Tacoma Intl
Sep 8
SEA7:33 pmSeattle/Tacoma Intl
7h 13m
1 stop
PHL5:46 amPhiladelphia

See travel insights to Seattle from

How to get the cheapest flight ticket from Philadelphia to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Seattle?

In general, March is the cheapest month to fly from Philadelphia to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $367. If you don’t want to visit Seattle in March, then you should wait until February to fly from Philadelphia, when ticket prices are also cheap, with an average price of $386.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Philadelphia is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $478. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Philadelphia because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $573.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Philadelphia at noon is the least expensive time of day to depart. momondo users have found prices as low as $416 when looking at flights departing at noon. Flights to Seattle are more costly in the morning, with an average ticket price of $548. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Philadelphia to Seattle/Tacoma Intl flight route?

Fly from Philadelphia to Seattle/Tacoma Intl for the best Philadelphia - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Philadelphia when booking 8 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $435 when searching 8 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Philadelphia for as low as $399 on momondo.

What cabin class options are available on Philadelphia to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on Philadelphia to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Philadelphia to Seattle flight prices changed over time?

As of April 2025, prices for Philadelphia to Seattle flights are approximately 18% cheaper when compared to flights at the same time last year.

When to book flights from Philadelphia to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Philadelphia to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Philadelphia to Seattle (PHL to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Philadelphia to Seattle

Best Price Found

$91

Fastest flight time

5h 52m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Philadelphia in the past 72 hours is $91. The best round-trip flight deal from Philadelphia to Seattle found on momondo in the last 72 hours is $169.
The fastest flight from Philadelphia to Seattle takes 5h 52m
Direct flights go from Philadelphia to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

  • How far is Philadelphia to Seattle/Tacoma Intl by plane?

    The straight-line distance from Philadelphia to Seattle/Tacoma Intl is 2372.3 mi. 5h 59m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport refresh daily.

  • How many operators does momondo search for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Philadelphia Airport to Seattle/Tacoma Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Philadelphia to Seattle?

  • What is the most popular airline from Philadelphia to Seattle?


Best airlines flying from Philadelphia to Seattle

Compare and see reviews for airlines that fly from Philadelphia to Seattle with momondo
Airline
Rating
Free Cancellation
Price
JetBluePriceFrom $115Free CancellationRating
7.3
2,924 reviews
Search JetBlue flights
FrontierPriceFrom $129Free CancellationRating
5.9
3,283 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $139Free CancellationRating
6.3
7,940 reviews
Search Spirit Airlines flights
Sun Country AirPriceFrom $199Free CancellationRating
6.9
348 reviews
Search Sun Country Air flights
DeltaPriceFrom $287Free CancellationRating
8.0
7,920 reviews
Search Delta flights
Alaska AirlinesPriceFrom $290Free CancellationRating
8.0
9,911 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $295Free CancellationRating
7.4
8,685 reviews
Search United Airlines flights
Hawaiian AirlinesPriceFrom $297Free CancellationRating
7.9
2,393 reviews
Search Hawaiian Airlines flights
American AirlinesPriceFrom $306Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $327Free CancellationRating
8.0
4,287 reviews
Search Southwest flights
  • Alaska Airlines Flights From Philadelphia to Seattle

    Alaska Airlines flies from Philadelphia to Seattle around 2 times per week, with 9,918 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Philadelphia to Seattle in the last 72 hours was $290 (round-trip), much lower than the average airfare cost of $480 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Philadelphia to Seattle

    Hawaiian Airlines (7.9/10 from 2,393 reviews) operates around 14 flights from Philadelphia to Seattle in any given week. The average Hawaiian Airlines airfare for this route is around $473, with deals from around $297 rare but found on momondo. Referenced prices are for round-trip Philadelphia to Seattle flight searches in the last 72 hours.


Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Tacoma
SeaTac
Ocean Shores
Olympia
Kent
Renton
Federal Way
Tukwila
Puyallup
Kirkland
Lakewood
Lynnwood
Fife
Shoreline
Marysville
Centralia
Redmond
Cle Elum
Lacey

Why use momondo?

Why should I use momondo to find a flight deal from Philadelphia to Seattle?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Philadelphia to Seattle. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Philadelphia to Seattle with flexible booking policies on momondo?

Yes. All flights to Seattle from Philadelphia on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Philadelphia to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from Philadelphia. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Philadelphia to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Philadelphia to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.


An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
From?
To?
Mon 4/28
Mon 5/5

Find better results for your trip to the United States