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Cheap flights from Philadelphia to Seattle from $84

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 5/2. 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

Enter your travel dates to find the best prices.
Frontier Logo
5:05 am - 10:19 am
PHL
-
SEA
32h 14m
2 stops
Frontier Logo
12:24 pm - 5:31 am
SEA
-
PHL
14h 07m
1 stop
$239Frontier
Sat, Mar 7 - Thu, Mar 12
Frontier Logo
8:25 pm - 9:27 am
PHL
-
SEA
16h 02m
1 stop
Frontier Logo
6:57 pm - 11:02 am
SEA
-
PHL
13h 05m
2 stops
$241Frontier
Sat, Apr 18 - Wed, Apr 22
Frontier Logo
12:28 pm - 11:19 am
PHL
-
SEA
25h 51m
2 stops
Frontier Logo
12:24 pm - 5:31 am
SEA
-
PHL
14h 07m
1 stop
$245Frontier
Thu, Mar 5 - Thu, Mar 12
Frontier Logo
8:33 pm - 5:09 pm
PHL
-
SEA
23h 36m
2 stops
Frontier Logo
12:24 pm - 5:31 am
SEA
-
PHL
14h 07m
1 stop
$249Frontier
Mon, Mar 9 - Mon, Mar 16
Frontier Logo
5:47 pm - 10:55 am
PHL
-
SEA
20h 08m
1 stop
Frontier Logo
1:16 pm - 4:37 pm
SEA
-
PHL
24h 21m
1 stop
$253Frontier
Thu, Feb 26 - Sat, Feb 28
Frontier Logo
8:25 pm - 9:27 am
PHL
-
SEA
16h 02m
1 stop
Frontier Logo
4:20 pm - 5:34 am
SEA
-
PHL
10h 14m
1 stop
$255Frontier
Fri, Apr 24 - Thu, Apr 30
Frontier Logo
12:21 pm - 12:01 pm
PHL
-
SEA
50h 40m
2 stops
Frontier Logo
12:24 pm - 5:31 am
SEA
-
PHL
14h 07m
1 stop
$257Frontier
Tue, Mar 3 - Mon, Mar 9
Multiple Airlines Logo
6:47 pm - 9:52 pm
PHL
-
SEA
6h 05mnonstop
Multiple Airlines Logo
6:57 pm - 5:34 am
SEA
-
PHL
7h 37m
1 stop
$259Multiple Airlines
Tue, Apr 7 - Tue, Apr 14
Multiple Airlines Logo
8:25 pm - 3:05 pm
PHL
-
SEA
21h 40m
1 stop
Multiple Airlines Logo
9:44 pm - 6:02 am
SEA
-
PHL
5h 18mnonstop
$264Multiple Airlines
Thu, May 7 - Tue, May 12
Frontier Logo
8:25 pm - 9:27 am
PHL
-
SEA
16h 02m
1 stop
Frontier Logo
6:57 pm - 5:34 am
SEA
-
PHL
7h 37m
1 stop
$266Frontier
Fri, May 1 - Sat, May 9

Frontier flights from Philadelphia to Seattle

Our best Frontier deals on Philadelphia to Seattle flight tickets
Frontier
Mar 7
PHL5:05 amPhiladelphia
32h 14m
2 stops
SEA10:19 amSeattle/Tacoma Intl
Mar 12
SEA12:24 pmSeattle/Tacoma Intl
14h 07m
1 stop
PHL5:31 amPhiladelphia
$239
Frontier
Apr 18
PHL8:25 pmPhiladelphia
16h 02m
1 stop
SEA9:27 amSeattle/Tacoma Intl
Apr 22
SEA6:57 pmSeattle/Tacoma Intl
13h 05m
2 stops
PHL11:02 amPhiladelphia
$241
Frontier
Mar 5
PHL12:28 pmPhiladelphia
25h 51m
2 stops
SEA11:19 amSeattle/Tacoma Intl
Mar 12
SEA12:24 pmSeattle/Tacoma Intl
14h 07m
1 stop
PHL5:31 amPhiladelphia
$245

Southwest flights from Philadelphia to Seattle

Our best Southwest deals on Philadelphia to Seattle flight tickets
Southwest
Feb 28
PHL5:40 pmPhiladelphia
8h 10m
1 stop
SEA10:50 pmSeattle/Tacoma Intl
Mar 4
SEA6:45 amSeattle/Tacoma Intl
7h 20m
1 stop
PHL5:05 pmPhiladelphia
$272
Southwest
Feb 28
PHL5:40 pmPhiladelphia
8h 10m
1 stop
SEA10:50 pmSeattle/Tacoma Intl
Mar 4
SEA8:45 amSeattle/Tacoma Intl
10h 15m
2 stops
PHL10:00 pmPhiladelphia
$278
Southwest
Feb 28
PHL5:40 pmPhiladelphia
8h 10m
1 stop
SEA10:50 pmSeattle/Tacoma Intl
Mar 7
SEA5:00 amSeattle/Tacoma Intl
9h 30m
1 stop
PHL5:30 pmPhiladelphia
$280

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 February 3, 2026.
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

Sat 3/7

5:05 am-10:19 am

2 stops32h 14m

Seattle/Tacoma Intl

Thu 3/12

12:24 pm-5:31 am

1 stop14h 07m

$239

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 4/18

8:25 pm-9:27 am

1 stop16h 02m

Seattle/Tacoma Intl

Wed 4/22

6:57 pm-11:02 am

2 stops13h 05m

$241

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 3/5

12:28 pm-11:19 am

2 stops25h 51m

Seattle/Tacoma Intl

Thu 3/12

12:24 pm-5:31 am

1 stop14h 07m

$245

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Mon 3/9

8:33 pm-5:09 pm

2 stops23h 36m

Seattle/Tacoma Intl

Mon 3/16

12:24 pm-5:31 am

1 stop14h 07m

$249

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 2/26

5:47 pm-10:55 am

1 stop20h 08m

Seattle/Tacoma Intl

Sat 2/28

1:16 pm-4:37 pm

1 stop24h 21m

$253

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 4/24

8:25 pm-9:27 am

1 stop16h 02m

Seattle/Tacoma Intl

Thu 4/30

4:20 pm-5:34 am

1 stop10h 14m

$255

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 3/3

12:21 pm-12:01 pm

2 stops50h 40m

Seattle/Tacoma Intl

Mon 3/9

12:24 pm-5:31 am

1 stop14h 07m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 4/7

6:47 pm-9:52 pm

Nonstop6h 05m

Seattle/Tacoma Intl

Tue 4/14

6:57 pm-5:34 am

1 stop7h 37m

$259

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 5/7

8:25 pm-3:05 pm

1 stop21h 40m

Seattle/Tacoma Intl

Tue 5/12

9:44 pm-6:02 am

Nonstop5h 18m

$264

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 5/1

8:25 pm-9:27 am

1 stop16h 02m

Seattle/Tacoma Intl

Sat 5/9

6:57 pm-5:34 am

1 stop7h 37m

$266

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 $317. If you don’t want to visit Seattle in October, then you should wait until March to fly from Philadelphia, when ticket prices are also cheap, with an average price of $337.

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 $459. 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 $586.

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

Flying to Seattle from Philadelphia in the evening is the least expensive time of day to depart. momondo users have found prices as low as $444 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $512. 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 $406 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 $369 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 February 2026, prices for Philadelphia to Seattle flights are approximately 8% 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

$212

Fastest flight time

5h 49m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Philadelphia in the past 72 hours is $212. The best round-trip flight deal from Philadelphia to Seattle found on momondo in the last 72 hours is $338.
The fastest flight from Philadelphia to Seattle takes 5h 49m
Direct flights go from Philadelphia to Seattle every day.
There is 1 airport in Seattle. From Philadelphia there are direct flights to 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 49m 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 $106Free CancellationRating
6.3
8,399 reviews
Search Spirit Airlines flights
FrontierPriceFrom $130Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
DeltaPriceFrom $168Free CancellationRating
7.9
8,135 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $173Free CancellationRating
7.8
2,830 reviews
Search Hawaiian Airlines flights
Sun Country AirPriceFrom $211Free CancellationRating
6.9
342 reviews
Search Sun Country Air flights
SouthwestPriceFrom $236Free CancellationRating
8.0
4,272 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $253Free CancellationRating
8.0
11,831 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $272Free CancellationRating
7.4
9,231 reviews
Search United Airlines flights
American AirlinesPriceFrom $277Free CancellationRating
7.2
11,212 reviews
Search American Airlines flights

  • Alaska Airlines Flights From Philadelphia to Seattle

    Alaska Airlines flies from Philadelphia to Seattle around 1 time per week, with 11,831 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Philadelphia to Seattle in the last 72 hours was $253 (round-trip), much lower than the average airfare cost of $475 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Philadelphia to Seattle

    Hawaiian Airlines (7.8/10 from 2,830 reviews) operates around 8 flights from Philadelphia to Seattle in any given week. The average Hawaiian Airlines airfare for this route is around $461, with deals from around $173 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
Redmond
Puyallup
Cle Elum
Tukwila
Lakewood
Federal Way
Westport
Kirkland
Centralia
Fife
Tumwater

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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