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Cheap flights from Philadelphia to Seattle from $147

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 1/10. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:00 pm - 12:30 pmPHL-SEA
41h 30m2 stops
Frontier Logo
2:54 pm - 3:34 pmSEA-PHL
21h 40m1 stop
$257Frontier
Find Deal
Tue, Dec 16 - Sun, Jan 11
Frontier Logo
3:30 pm - 10:06 amPHL-SEA
21h 36m2 stops
Frontier Logo
9:45 am - 12:34 amSEA-PHL
11h 49m1 stop
$259Frontier
Find Deal
Wed, Dec 10 - Mon, Dec 15
United Airlines Logo
12:45 pm - 7:22 pmPHL-SEA
9h 37m1 stop
United Airlines Logo
7:00 am - 5:39 pmSEA-PHL
7h 39m1 stop
$262United Airlines
Find Deal
Tue, Dec 9 - Wed, Dec 17
Delta Logo
6:07 pm - 11:58 pmPHL-SEA
8h 51m1 stop
Delta Logo
7:11 pm - 5:50 amSEA-PHL
7h 39m1 stop
$267Delta
Find Deal
Wed, Dec 10 - Mon, Dec 15
United Airlines Logo
12:45 pm - 7:22 pmPHL-SEA
9h 37m1 stop
United Airlines Logo
5:00 am - 5:39 pmSEA-PHL
9h 39m2 stops
$268United Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Delta Logo
4:58 pm - 11:59 pmPHL-SEA
10h 01m1 stop
Delta Logo
5:25 am - 5:40 pmSEA-PHL
9h 15m1 stop
$272Delta
Find Deal
Thu, Nov 27 - Tue, Dec 2
American Airlines Logo
6:40 pm - 9:59 pmPHL-SEA
6h 19mnonstop
American Airlines Logo
11:07 pm - 7:08 amSEA-PHL
5h 01mnonstop
$282American Airlines
Find Deal
Wed, Dec 17 - Mon, Jan 5
Alaska Airlines Logo
7:06 am - 10:20 amPHL-SEA
6h 14mnonstop
Alaska Airlines Logo
9:35 pm - 5:46 amSEA-PHL
5h 11mnonstop
$284Alaska Airlines
Find Deal
Tue, Dec 9 - Fri, Dec 12
Alaska Airlines Logo
6:54 pm - 10:12 pmPHL-SEA
6h 18mnonstop
Alaska Airlines Logo
9:35 pm - 5:46 amSEA-PHL
5h 11mnonstop
$287Alaska Airlines
Find Deal
Mon, Dec 8 - Wed, Dec 10
American Airlines Logo
6:40 pm - 9:59 pmPHL-SEA
6h 19mnonstop
American Airlines Logo
12:38 am - 1:15 pmSEA-PHL
9h 37m1 stop
$301American Airlines
Find Deal
Sat, Dec 6 - Sat, Dec 6

Frontier flights from Philadelphia to Seattle

Our best Frontier deals on Philadelphia to Seattle flight tickets
Frontier
Dec 16
PHL10:00 pmPhiladelphia
41h 30m
2 stops
SEA12:30 pmSeattle/Tacoma Intl
Jan 11
SEA2:54 pmSeattle/Tacoma Intl
21h 40m
1 stop
PHL3:34 pmPhiladelphia
$257
Find similar
Frontier
Dec 10
PHL3:30 pmPhiladelphia
21h 36m
2 stops
SEA10:06 amSeattle/Tacoma Intl
Dec 15
SEA9:45 amSeattle/Tacoma Intl
11h 49m
1 stop
PHL12:34 amPhiladelphia
$259
Find similar
Frontier
Dec 10
PHL3:30 pmPhiladelphia
21h 36m
2 stops
SEA10:06 amSeattle/Tacoma Intl
Dec 14
SEA12:48 pmSeattle/Tacoma Intl
13h 43m
1 stop
PHL5:31 amPhiladelphia
$270
Find similar

United Airlines flights from Philadelphia to Seattle

Our best United Airlines deals on Philadelphia to Seattle flight tickets
United Airlines
Dec 9
PHL12:45 pmPhiladelphia
9h 37m
1 stop
SEA7:22 pmSeattle/Tacoma Intl
Dec 17
SEA7:00 amSeattle/Tacoma Intl
7h 39m
1 stop
PHL5:39 pmPhiladelphia
$262
Find similar
United Airlines
Dec 3
PHL12:45 pmPhiladelphia
9h 37m
1 stop
SEA7:22 pmSeattle/Tacoma Intl
Dec 10
SEA5:00 amSeattle/Tacoma Intl
9h 39m
2 stops
PHL5:39 pmPhiladelphia
$268
Find similar
United Airlines
Jan 25
PHL10:30 amPhiladelphia
10h 56m
2 stops
SEA6:26 pmSeattle/Tacoma Intl
Jan 31
SEA5:00 amSeattle/Tacoma Intl
9h 34m
2 stops
PHL5:34 pmPhiladelphia
$277
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Philadelphia to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated November 9, 2025.
Use the filters below to find and compare flights from Philadelphia to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 12/16

10:00 pm-12:30 pm

2 stops41h 30m

Seattle/Tacoma Intl

Sun 1/11

2:54 pm-3:34 pm

1 stop21h 40m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 12/10

3:30 pm-10:06 am

2 stops21h 36m

Seattle/Tacoma Intl

Mon 12/15

9:45 am-12:34 am

1 stop11h 49m

$259

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 12/9

12:45 pm-7:22 pm

1 stop9h 37m

Seattle/Tacoma Intl

Wed 12/17

7:00 am-5:39 pm

1 stop7h 39m

$262

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 12/10

6:07 pm-11:58 pm

1 stop8h 51m

Seattle/Tacoma Intl

Mon 12/15

7:11 pm-5:50 am

1 stop7h 39m

$267

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 12/3

12:45 pm-7:22 pm

1 stop9h 37m

Seattle/Tacoma Intl

Wed 12/10

5:00 am-5:39 pm

2 stops9h 39m

$268

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 11/27

4:58 pm-11:59 pm

1 stop10h 01m

Seattle/Tacoma Intl

Tue 12/2

5:25 am-5:40 pm

1 stop9h 15m

$272

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 12/17

6:40 pm-9:59 pm

Nonstop6h 19m

Seattle/Tacoma Intl

Mon 1/5

11:07 pm-7:08 am

Nonstop5h 01m

$282

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 12/9

7:06 am-10:20 am

Nonstop6h 14m

Seattle/Tacoma Intl

Fri 12/12

9:35 pm-5:46 am

Nonstop5h 11m

$284

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Mon 12/8

6:54 pm-10:12 pm

Nonstop6h 18m

Seattle/Tacoma Intl

Wed 12/10

9:35 pm-5:46 am

Nonstop5h 11m

$287

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 12/6

6:40 pm-9:59 pm

Nonstop6h 19m

Seattle/Tacoma Intl

Sat 12/6

12:38 am-1:15 pm

1 stop9h 37m

$301

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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, October 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 $327. If you don’t want to visit Seattle in October, then you should wait until February to fly from Philadelphia, when ticket prices are also cheap, with an average price of $367.

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 Thursday. momondo users have found tickets for Thursday departures for as low as $472. 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 $594.

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 $526. 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 $420 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 $387 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.

Can stopping save me money on Philadelphia to Seattle flights?

No. A direct flight is the cheapest option for a flight between Philadelphia to Seattle.

How have Philadelphia to Seattle flight prices changed over time?

As of November 2025, prices for Philadelphia to Seattle flights are approximately 4% 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

$216

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 $216. The best round-trip flight deal from Philadelphia to Seattle found on momondo in the last 72 hours is $365.
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)
Search flight deals

  • 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 07m 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
Spirit AirlinesPriceFrom $127Free CancellationRating
6.3
8,132 reviews
Search Spirit Airlines flights
FrontierPriceFrom $130Free CancellationRating
5.8
3,111 reviews
Search Frontier flights
DeltaPriceFrom $233Free CancellationRating
7.9
8,004 reviews
Search Delta flights
Sun Country AirPriceFrom $238Free CancellationRating
6.9
335 reviews
Search Sun Country Air flights
Hawaiian AirlinesPriceFrom $257Free CancellationRating
7.8
2,804 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $277Free CancellationRating
8.0
11,257 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $277Free CancellationRating
7.2
11,044 reviews
Search American Airlines flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
9,012 reviews
Search United Airlines flights
SouthwestPriceFrom $294Free CancellationRating
8.0
4,236 reviews
Search Southwest flights

  • Alaska Airlines Flights From Philadelphia to Seattle

    Alaska Airlines flies from Philadelphia to Seattle around 2 times per week, with 11,258 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Philadelphia to Seattle in the last 72 hours was $277 (round-trip), much lower than the average airfare cost of $490 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Philadelphia to Seattle

    Hawaiian Airlines (7.8/10 from 2,804 reviews) operates around 12 flights from Philadelphia to Seattle in any given week. The average Hawaiian Airlines airfare for this route is around $474, with deals from around $257 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
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Puyallup
Marysville
Redmond
Tukwila
Lakewood
Federal Way
Fife
Cle Elum
Centralia
Kirkland
Westport
Shoreline

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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