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Cheap flights from Seattle to Philadelphia from $139

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Philadelphia departing on 5/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to Philadelphia

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
10:57 pm - 7:02 am
SEA
-
PHL
5h 05mnonstop
American Airlines Logo
6:35 pm - 9:57 pm
PHL
-
SEA
6h 22mnonstop
$237American Airlines
Thu, Feb 26 - Tue, Mar 3
Frontier Logo
1:16 pm - 5:55 pm
SEA
-
PHL
25h 39m
1 stop
Frontier Logo
5:47 pm - 11:19 am
PHL
-
SEA
20h 32m
1 stop
$240Frontier
Thu, Feb 26 - Sun, Mar 1
Frontier Logo
1:16 pm - 5:55 pm
SEA
-
PHL
25h 39m
1 stop
Frontier Logo
11:40 am - 12:01 pm
PHL
-
SEA
27h 21m
2 stops
$241Frontier
Thu, Feb 19 - Wed, Feb 25
Frontier Logo
12:00 pm - 4:37 pm
SEA
-
PHL
25h 37m
1 stop
Frontier Logo
7:05 pm - 12:01 pm
PHL
-
SEA
19h 56m
1 stop
$249Frontier
Sun, Feb 22 - Fri, Feb 27
Frontier Logo
6:57 pm - 5:34 am
SEA
-
PHL
7h 37m
1 stop
Frontier Logo
8:25 pm - 9:27 am
PHL
-
SEA
16h 02m
1 stop
$252Frontier
Sat, May 2 - Wed, May 6
United Airlines Logo
9:19 am - 9:33 pm
SEA
-
PHL
9h 14m
1 stop
United Airlines Logo
5:00 pm - 10:43 pm
PHL
-
SEA
8h 43m
1 stop
$253United Airlines
Mon, Feb 23 - Wed, Mar 4
Frontier Logo
12:24 pm - 5:31 am
SEA
-
PHL
14h 07m
1 stop
Frontier Logo
5:05 am - 9:03 pm
PHL
-
SEA
18h 58m
2 stops
$255Frontier
Fri, Mar 6 - Wed, Mar 11
Frontier Logo
12:24 pm - 5:31 am
SEA
-
PHL
14h 07m
1 stop
Frontier Logo
8:33 pm - 5:09 pm
PHL
-
SEA
23h 36m
2 stops
$256Frontier
Fri, Mar 6 - Mon, Mar 9
Delta Logo
6:00 am - 6:08 pm
SEA
-
PHL
9h 08m
1 stop
Delta Logo
5:32 pm - 9:49 pm
PHL
-
SEA
7h 17m
1 stop
$257Delta
Fri, Apr 17 - Tue, Apr 21
Frontier Logo
1:16 pm - 5:55 pm
SEA
-
PHL
25h 39m
1 stop
Frontier Logo
4:14 pm - 8:13 am
PHL
-
SEA
42h 59m
2 stops
$258Frontier
Thu, Feb 19 - Tue, Feb 24

American Airlines flights from Seattle to Philadelphia

Our best American Airlines deals on Seattle to Philadelphia flight tickets
American Airlines
Feb 26
SEA10:57 pmSeattle/Tacoma Intl
5h 05m
PHL7:02 amPhiladelphia
Mar 2
PHL6:35 pmPhiladelphia
6h 22m
SEA9:57 pmSeattle/Tacoma Intl
$237
American Airlines
Feb 25
SEA10:57 pmSeattle/Tacoma Intl
5h 05m
PHL7:02 amPhiladelphia
Mar 1
PHL5:17 pmPhiladelphia
10h 38m
1 stop
SEA12:55 amSeattle/Tacoma Intl
$322
American Airlines
Mar 9
SEA10:57 pmSeattle/Tacoma Intl
5h 05m
PHL7:02 amPhiladelphia
Mar 13
PHL6:35 pmPhiladelphia
6h 22m
SEA9:57 pmSeattle/Tacoma Intl
$339

United Airlines flights from Seattle to Philadelphia

Our best United Airlines deals on Seattle to Philadelphia flight tickets
United Airlines
Feb 23
SEA9:19 amSeattle/Tacoma Intl
9h 14m
1 stop
PHL9:33 pmPhiladelphia
Mar 4
PHL5:00 pmPhiladelphia
8h 43m
1 stop
SEA10:43 pmSeattle/Tacoma Intl
$253
United Airlines
Feb 23
SEA7:00 amSeattle/Tacoma Intl
7h 14m
1 stop
PHL5:14 pmPhiladelphia
Mar 4
PHL10:35 amPhiladelphia
11h 28m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$262
United Airlines
Feb 18
SEA9:19 amSeattle/Tacoma Intl
9h 14m
1 stop
PHL9:33 pmPhiladelphia
Feb 25
PHL12:55 pmPhiladelphia
9h 08m
1 stop
SEA7:03 pmSeattle/Tacoma Intl
$273

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Philadelphia 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 January 29, 2026.
Use the filters below to find and compare flights from Seattle to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/26

10:57 pm-7:02 am

Nonstop5h 05m

Philadelphia

Tue 3/3

6:35 pm-9:57 pm

Nonstop6h 22m

$237

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/26

1:16 pm-5:55 pm

1 stop25h 39m

Philadelphia

Sun 3/1

5:47 pm-11:19 am

1 stop20h 32m

$240

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/19

1:16 pm-5:55 pm

1 stop25h 39m

Philadelphia

Wed 2/25

11:40 am-12:01 pm

2 stops27h 21m

$241

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 2/22

12:00 pm-4:37 pm

1 stop25h 37m

Philadelphia

Fri 2/27

7:05 pm-12:01 pm

1 stop19h 56m

$249

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 5/2

6:57 pm-5:34 am

1 stop7h 37m

Philadelphia

Wed 5/6

8:25 pm-9:27 am

1 stop16h 02m

$252

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 2/23

9:19 am-9:33 pm

1 stop9h 14m

Philadelphia

Wed 3/4

5:00 pm-10:43 pm

1 stop8h 43m

$253

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 3/6

12:24 pm-5:31 am

1 stop14h 07m

Philadelphia

Wed 3/11

5:05 am-9:03 pm

2 stops18h 58m

$255

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 3/6

12:24 pm-5:31 am

1 stop14h 07m

Philadelphia

Mon 3/9

8:33 pm-5:09 pm

2 stops23h 36m

$256

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 4/17

6:00 am-6:08 pm

1 stop9h 08m

Philadelphia

Tue 4/21

5:32 pm-9:49 pm

1 stop7h 17m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/19

1:16 pm-5:55 pm

1 stop25h 39m

Philadelphia

Tue 2/24

4:14 pm-8:13 am

2 stops42h 59m

$258

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 Philadelphia from

How to get the cheapest flight ticket from Seattle to Philadelphia

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 Philadelphia?

The cheapest month to fly to Philadelphia from Seattle is in October. Flight prices, which tend to average around $337, are often lower during this time because this is during the off-season. The month of January is another great option to travel to Philadelphia, with average flight prices from Seattle averaging around $368.

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

The cheapest day to depart from Seattle to Philadelphia is on a Wednesday. Travelers who choose to depart for Philadelphia on a Wednesday will often find tickets for as low as $452. On the other hand, Sunday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $572.

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

According to our data, the cheapest time of day to fly to Philadelphia is in the evening. momondo users have found flights departing from Seattle to Philadelphia in the evening for as low as $442. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Philadelphia is in the afternoon when prices are around $726.

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

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

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

You are more likely to see cheaper flights to Philadelphia from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Philadelphia for around $424 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Philadelphia from Seattle for as low as $365 on momondo.

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

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Philadelphia 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 Seattle to Philadelphia flights?

You could potentially save up to 7% on your flight if you consider stops on a Seattle to Philadelphia flight.

How have Seattle to Philadelphia flight prices changed over time?

As of January 2026, prices for Seattle to Philadelphia flights are approximately 11% more expensive when compared to flights at the same time last year.

When to book flights from Seattle to Philadelphia

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

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

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

Best Price Found

$173

Fastest flight time

5h 05m

Direct flights

Every day

Airports in Philadelphia

1 airport
The best one-way flight to Philadelphia from Seattle in the past 72 hours is $173. The best round-trip flight deal from Seattle to Philadelphia found on momondo in the last 72 hours is $283.
The fastest flight from Seattle to Philadelphia takes 5h 05m
Direct flights go from Seattle to Philadelphia every day.
There is 1 airport in Philadelphia. From Seattle there are direct flights to Philadelphia (PHL).
Search flight deals

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

    The distance between Seattle/Tacoma Intl and Philadelphia is about 2372.3 mi. Typically, this will take 5h 05m by plane in normal conditions.

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

    Prices for flights from Seattle/Tacoma Intl Airport to Philadelphia Airport were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Philadelphia Airport.

  • What documentation or ID do you need to fly to Philadelphia Airport?

    The travel and health documents you'll need for your trip to Philadelphia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Philadelphia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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

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

Best airlines flying from Seattle to Philadelphia

Compare and see reviews for airlines that fly from Seattle to Philadelphia with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $72Free CancellationRating
6.3
8,394 reviews
Search Spirit Airlines flights
FrontierPriceFrom $131Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
DeltaPriceFrom $153Free CancellationRating
7.9
8,127 reviews
Search Delta flights
United AirlinesPriceFrom $206Free CancellationRating
7.4
9,215 reviews
Search United Airlines flights
Hawaiian AirlinesPriceFrom $228Free CancellationRating
7.8
2,830 reviews
Search Hawaiian Airlines flights
American AirlinesPriceFrom $258Free CancellationRating
7.2
11,206 reviews
Search American Airlines flights
Alaska AirlinesPriceFrom $274Free CancellationRating
8.0
11,808 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $351Free CancellationRating
8.0
4,267 reviews
Search Southwest flights

  • Alaska Airlines Flights From Seattle to Philadelphia

    Alaska Airlines flies from Seattle to Philadelphia around 7 times per week, with 11,808 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Seattle to Philadelphia in the last 72 hours was $274 (round-trip), much lower than the average airfare cost of $515 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Seattle to Philadelphia

    Hawaiian Airlines is also a popular choice for this route. Hawaiian Airlines flight deals for Seattle to Philadelphia start from as low as $228 round-trip, depending on your selected dates, with average Hawaiian Airlines deals seen on momondo around $510. Hawaiian Airlines operates 8 flights to Philadelphia from Seattle in an average week. Users have rated it 7.8/10 across 2,830 reviews.

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
Cape May
Rehoboth Beach
Wildwood Crest
Ocean City
King of Prussia
Cherry Hill
Newark
Dewey Beach
Reading
North Wildwood
Avalon
Dover
Lewes
Stone Harbor
Essington
Vineland
New Castle
Pottstown
Somers Point

Why use momondo?

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

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

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

momondo does allow users to show only those flights to Philadelphia from Seattle which offer a flexible booking policy as well as other useful filters and features.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Philadelphia.

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

If you are simply researching potential flights to Philadelphia, momondo offers a useful price alert feature which will track prices for flights to Philadelphia from Seattle and alert you when they change.

An easier way to manage your Philadelphia 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.
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