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Cheap flights from Philadelphia to Seattle from $144

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 1/23. 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.
Delta Logo
5:17 pm - 9:49 pmPHL-SEA
7h 32m1 stop
Delta Logo
11:10 pm - 11:53 amSEA-PHL
9h 43m1 stop
$257Delta
Find Deal
jue., ene. 8 - lun., ene. 12
Frontier Logo
8:36 pm - 12:30 pmPHL-SEA
18h 54m1 stop
Frontier Logo
6:33 pm - 5:40 amSEA-PHL
8h 07m1 stop
$258Frontier
Find Deal
jue., dic. 18 - mar., dic. 30
United Airlines Logo
10:30 am - 6:14 pmPHL-SEA
10h 44m2 stops
United Airlines Logo
9:25 am - 9:52 pmSEA-PHL
9h 27m1 stop
$262United Airlines
Find Deal
mar., ene. 6 - mar., ene. 13
Frontier Logo
8:36 pm - 11:53 amPHL-SEA
18h 17m1 stop
Frontier Logo
2:54 pm - 11:08 amSEA-PHL
17h 14m2 stops
$263Frontier
Find Deal
vie., dic. 12 - dom., dic. 21
Frontier Logo
7:10 am - 1:51 pmPHL-SEA
9h 41m1 stop
Frontier Logo
12:26 pm - 11:46 amSEA-PHL
20h 20m1 stop
$264Frontier
Find Deal
mié., dic. 31 - jue., ene. 8
Multiple Airlines Logo
9:00 am - 4:36 pmPHL-SEA
34h 36m2 stops
Multiple Airlines Logo
8:30 am - 10:50 pmSEA-PHL
11h 20m1 stop
$265Multiple Airlines
Find Deal
jue., ene. 8 - jue., ene. 15
American Airlines Logo
6:40 pm - 9:59 pmPHL-SEA
6h 19mnonstop
American Airlines Logo
6:12 am - 2:17 pmSEA-PHL
5h 05mnonstop
$267American Airlines
Find Deal
jue., dic. 18 - mar., ene. 13
Multiple Airlines Logo
7:06 pm - 10:29 pmPHL-SEA
6h 23mnonstop
Multiple Airlines Logo
12:19 pm - 4:32 pmSEA-PHL
25h 13m1 stop
$269Multiple Airlines
Find Deal
jue., ene. 8 - jue., ene. 15
United Airlines Logo
10:10 am - 4:01 pmPHL-SEA
8h 51m1 stop
United Airlines Logo
9:25 am - 9:52 pmSEA-PHL
9h 27m1 stop
$272United Airlines
Find Deal
dom., ene. 11 - dom., ene. 18
Frontier Logo
8:36 pm - 12:30 pmPHL-SEA
18h 54m1 stop
Frontier Logo
1:00 pm - 8:37 amSEA-PHL
40h 37m2 stops
$274Frontier
Find Deal
sáb., dic. 20 - mar., ene. 6

Frontier flights from Philadelphia to Seattle

Our best Frontier deals on Philadelphia to Seattle flight tickets
Frontier
Dec 18
PHL8:36 pmPhiladelphia
18h 54m
1 stop
SEA12:30 pmSeattle/Tacoma Intl
Dec 30
SEA6:33 pmSeattle/Tacoma Intl
8h 07m
1 stop
PHL5:40 amPhiladelphia
$258
Find similar
Frontier
Dec 12
PHL8:36 pmPhiladelphia
18h 17m
1 stop
SEA11:53 amSeattle/Tacoma Intl
Dec 21
SEA2:54 pmSeattle/Tacoma Intl
17h 14m
2 stops
PHL11:08 amPhiladelphia
$263
Find similar
Frontier
Dec 31
PHL7:10 amPhiladelphia
9h 41m
1 stop
SEA1:51 pmSeattle/Tacoma Intl
Jan 8
SEA12:26 pmSeattle/Tacoma Intl
20h 20m
1 stop
PHL11:46 amPhiladelphia
$264
Find similar

American Airlines flights from Philadelphia to Seattle

Our best American Airlines deals on Philadelphia to Seattle flight tickets
American Airlines
Dec 18
PHL6:40 pmPhiladelphia
6h 19m
SEA9:59 pmSeattle/Tacoma Intl
Jan 13
SEA6:12 amSeattle/Tacoma Intl
5h 05m
PHL2:17 pmPhiladelphia
$267
Find similar
American Airlines
Feb 17
PHL6:50 pmPhiladelphia
6h 28m
SEA10:18 pmSeattle/Tacoma Intl
Feb 19
SEA12:59 amSeattle/Tacoma Intl
8h 54m
1 stop
PHL12:53 pmPhiladelphia
$302
Find similar
American Airlines
Feb 17
PHL4:27 pmPhiladelphia
8h 48m
1 stop
SEA10:15 pmSeattle/Tacoma Intl
Feb 20
SEA11:18 pmSeattle/Tacoma Intl
4h 59m
PHL7:17 amPhiladelphia
$307
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 noviembre 26, 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

jue. 1/8

5:17 pm-9:49 pm

1 stop7h 32m

Seattle/Tacoma Intl

lun. 1/12

11:10 pm-11:53 am

1 stop9h 43m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

jue. 12/18

8:36 pm-12:30 pm

1 stop18h 54m

Seattle/Tacoma Intl

mar. 12/30

6:33 pm-5:40 am

1 stop8h 07m

$258

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

mar. 1/6

10:30 am-6:14 pm

2 stops10h 44m

Seattle/Tacoma Intl

mar. 1/13

9:25 am-9:52 pm

1 stop9h 27m

$262

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

vie. 12/12

8:36 pm-11:53 am

1 stop18h 17m

Seattle/Tacoma Intl

dom. 12/21

2:54 pm-11:08 am

2 stops17h 14m

$263

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

mié. 12/31

7:10 am-1:51 pm

1 stop9h 41m

Seattle/Tacoma Intl

jue. 1/8

12:26 pm-11:46 am

1 stop20h 20m

$264

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

jue. 1/8

9:00 am-4:36 pm

2 stops34h 36m

Seattle/Tacoma Intl

jue. 1/15

8:30 am-10:50 pm

1 stop11h 20m

$265

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

jue. 12/18

6:40 pm-9:59 pm

Nonstop6h 19m

Seattle/Tacoma Intl

mar. 1/13

6:12 am-2:17 pm

Nonstop5h 05m

$267

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

jue. 1/8

7:06 pm-10:29 pm

Nonstop6h 23m

Seattle/Tacoma Intl

jue. 1/15

12:19 pm-4:32 pm

1 stop25h 13m

$269

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

dom. 1/11

10:10 am-4:01 pm

1 stop8h 51m

Seattle/Tacoma Intl

dom. 1/18

9:25 am-9:52 pm

1 stop9h 27m

$272

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

sáb. 12/20

8:36 pm-12:30 pm

1 stop18h 54m

Seattle/Tacoma Intl

mar. 1/6

1:00 pm-8:37 am

2 stops40h 37m

$274

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 $358.

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 $469. 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 $599.

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 $419 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 28% more expensive 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

$240

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 $240. The best round-trip flight deal from Philadelphia to Seattle found on momondo in the last 72 hours is $356.
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. 5h 57m 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
8,159 reviews
Search Spirit Airlines flights
FrontierPriceFrom $134Free CancellationRating
5.8
3,101 reviews
Search Frontier flights
DeltaPriceFrom $227Free CancellationRating
7.9
8,003 reviews
Search Delta flights
Sun Country AirPriceFrom $238Free CancellationRating
6.9
333 reviews
Search Sun Country Air flights
Hawaiian AirlinesPriceFrom $257Free CancellationRating
7.8
2,815 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $276Free CancellationRating
7.4
9,050 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $277Free CancellationRating
8.0
11,360 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $277Free CancellationRating
7.2
11,039 reviews
Search American Airlines flights
SouthwestPriceFrom $296Free CancellationRating
8.0
4,253 reviews
Search Southwest flights

  • Alaska Airlines Flights From Philadelphia to Seattle

    Alaska Airlines flies from Philadelphia to Seattle around 6 times per week, with 11,363 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 $491 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Philadelphia to Seattle

    Hawaiian Airlines (7.8/10 from 2,815 reviews) operates around 13 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
Marysville
Puyallup
Redmond
Tukwila
Cle Elum
Lakewood
Federal Way
Fife
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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