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Cheap flights from Philadelphia to Seattle from $87

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 9/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Philadelphia to Seattle

Cheap round-trip flights

Southwest Logo
4:10 pm - 9:50 pmPHL-SEA
8h 40m1 stop
Southwest Logo
5:55 am - 4:05 pmSEA-PHL
7h 10m1 stop
$173Southwest
Find Deal
Sat, Sep 20 - Sat, Sep 27
Southwest Logo
1:40 pm - 8:55 pmPHL-SEA
10h 15m2 stops
Southwest Logo
5:35 am - 5:40 pmSEA-PHL
9h 05m1 stop
$179Southwest
Find Deal
Tue, Aug 19 - Tue, Aug 26
Southwest Logo
6:10 pm - 12:05 amPHL-SEA
8h 55m1 stop
Southwest Logo
5:35 am - 5:40 pmSEA-PHL
9h 05m1 stop
$183Southwest
Find Deal
Mon, Aug 25 - Wed, Aug 27
Southwest Logo
3:40 pm - 11:10 pmPHL-SEA
10h 30m2 stops
Southwest Logo
5:15 am - 5:40 pmSEA-PHL
9h 25m2 stops
$184Southwest
Find Deal
Wed, Sep 3 - Wed, Sep 10
Frontier Logo
6:45 am - 8:43 pmPHL-SEA
16h 58m1 stop
Frontier Logo
6:12 am - 12:57 amSEA-PHL
15h 45m1 stop
$232Frontier
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Sat, Sep 20 - Thu, Sep 25
Frontier Logo
6:25 am - 8:51 pmPHL-SEA
17h 26m1 stop
Frontier Logo
6:41 am - 4:54 amSEA-PHL
19h 13m1 stop
$234Frontier
Find Deal
Sat, Aug 23 - Wed, Aug 27
Frontier Logo
7:19 am - 2:06 pmPHL-SEA
9h 47m1 stop
Frontier Logo
3:11 pm - 5:49 amSEA-PHL
11h 38m1 stop
$236Frontier
Find Deal
Sun, Jul 27 - Fri, Aug 1
American Airlines Logo
9:14 am - 5:29 pmPHL-SEA
11h 15m1 stop
American Airlines Logo
11:05 pm - 7:09 amSEA-PHL
5h 04mnonstop
$244American Airlines
Find Deal
Sat, Sep 20 - Mon, Sep 29
American Airlines Logo
6:50 pm - 10:04 pmPHL-SEA
6h 14mnonstop
American Airlines Logo
11:05 pm - 7:09 amSEA-PHL
5h 04mnonstop
$277American Airlines
Find Deal
Sat, Sep 20 - Mon, Sep 29
American Airlines Logo
7:10 pm - 10:26 pmPHL-SEA
6h 16mnonstop
American Airlines Logo
11:05 pm - 7:09 amSEA-PHL
5h 04mnonstop
$278American Airlines
Find Deal
Fri, Aug 29 - Fri, Sep 5

American Airlines flights from Philadelphia to Seattle

Our best American Airlines deals on Philadelphia to Seattle flight tickets
American Airlines
Sep 20
PHL9:14 amPhiladelphia
11h 15m
1 stop
SEA5:29 pmSeattle/Tacoma Intl
Sep 29
SEA11:05 pmSeattle/Tacoma Intl
5h 04m
PHL7:09 amPhiladelphia
$244
Find similar
American Airlines
Sep 20
PHL6:50 pmPhiladelphia
6h 14m
SEA10:04 pmSeattle/Tacoma Intl
Sep 29
SEA11:05 pmSeattle/Tacoma Intl
5h 04m
PHL7:09 amPhiladelphia
$277
Find similar
American Airlines
Aug 29
PHL7:10 pmPhiladelphia
6h 16m
SEA10:26 pmSeattle/Tacoma Intl
Sep 5
SEA11:05 pmSeattle/Tacoma Intl
5h 04m
PHL7:09 amPhiladelphia
$278
Find similar

Southwest flights from Philadelphia to Seattle

Our best Southwest deals on Philadelphia to Seattle flight tickets
Southwest
Sep 20
PHL4:10 pmPhiladelphia
8h 40m
1 stop
SEA9:50 pmSeattle/Tacoma Intl
Sep 27
SEA5:55 amSeattle/Tacoma Intl
7h 10m
1 stop
PHL4:05 pmPhiladelphia
$173
Find similar
Southwest
Aug 19
PHL1:40 pmPhiladelphia
10h 15m
2 stops
SEA8:55 pmSeattle/Tacoma Intl
Aug 26
SEA5:35 amSeattle/Tacoma Intl
9h 05m
1 stop
PHL5:40 pmPhiladelphia
$179
Find similar
Southwest
Aug 25
PHL6:10 pmPhiladelphia
8h 55m
1 stop
SEA12:05 amSeattle/Tacoma Intl
Aug 27
SEA5:35 amSeattle/Tacoma Intl
9h 05m
1 stop
PHL5:40 pmPhiladelphia
$183
Find similar

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 $391.

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 Wednesday. momondo users have found tickets for Wednesday departures for as low as $474. 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 $581.

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 $541. 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 weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $432 when searching 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 $384 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 July 2025, prices for Philadelphia to Seattle flights are approximately 39% 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

$87

Fastest flight time

5h 57m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Philadelphia in the past 72 hours is $87. The best round-trip flight deal from Philadelphia to Seattle found on momondo in the last 72 hours is $173.
The fastest flight from Philadelphia to Seattle takes 5h 57m
Direct flights go from Philadelphia to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
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  • How far is Philadelphia to Seattle/Tacoma Intl by plane?

    The straight-line distance from Philadelphia to Seattle/Tacoma Intl is 2372.3 mi. 6h 14m 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
FrontierPriceFrom $128Free CancellationRating
5.9
3,271 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $136Free CancellationRating
6.3
8,055 reviews
Search Spirit Airlines flights
Sun Country AirPriceFrom $198Free CancellationRating
6.9
335 reviews
Search Sun Country Air flights
DeltaPriceFrom $279Free CancellationRating
8.0
7,952 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $284Free CancellationRating
7.8
2,561 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
8,846 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $296Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $297Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $316Free CancellationRating
8.0
4,250 reviews
Search Southwest flights

  • Alaska Airlines Flights From Philadelphia to Seattle

    Alaska Airlines flies from Philadelphia to Seattle around 6 times per week, with 10,000 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Philadelphia to Seattle in the last 72 hours was $296 (round-trip), much lower than the average airfare cost of $488 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Philadelphia to Seattle

    Hawaiian Airlines (7.8/10 from 2,561 reviews) operates around 12 flights from Philadelphia to Seattle in any given week. The average Hawaiian Airlines airfare for this route is around $494, with deals from around $284 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
Renton
Federal Way
Kent
Lynnwood
Puyallup
Marysville
Tukwila
Kirkland
Lakewood
Fife
Shoreline
Centralia
Cle Elum
Westport
Redmond

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.

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