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Cheap flights from Seattle to Philadelphia 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 Seattle to Philadelphia departing on 1/28. 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.
Alaska Airlines Logo
9:44 am - 5:53 pmSEA-PHL
5h 09mnonstop
Alaska Airlines Logo
6:54 pm - 10:12 pmPHL-SEA
6h 18mnonstop
$257Alaska Airlines
Find Deal
Thu, Dec 4 - Sun, Dec 7
Frontier Logo
9:53 pm - 12:39 amSEA-PHL
23h 46m2 stops
Frontier Logo
4:12 pm - 8:46 amPHL-SEA
19h 34m1 stop
$259Frontier
Find Deal
Mon, Nov 24 - Thu, Dec 4
Frontier Logo
9:53 pm - 2:21 pmSEA-PHL
37h 28m2 stops
Frontier Logo
8:36 pm - 12:36 pmPHL-SEA
19h 00m1 stop
$260Frontier
Find Deal
Mon, Dec 1 - Fri, Dec 19
Frontier Logo
2:54 pm - 5:31 amSEA-PHL
11h 37m1 stop
Frontier Logo
7:10 am - 10:11 amPHL-SEA
30h 01m1 stop
$261Frontier
Find Deal
Sun, Dec 28 - Sun, Jan 4
Frontier Logo
1:25 pm - 5:31 amSEA-PHL
13h 06m1 stop
Frontier Logo
4:39 pm - 1:41 pmPHL-SEA
24h 02m2 stops
$265Frontier
Find Deal
Thu, Dec 18 - Fri, Jan 9
Frontier Logo
12:46 pm - 4:45 amSEA-PHL
12h 59m1 stop
Frontier Logo
7:40 am - 11:56 amPHL-SEA
31h 16m2 stops
$266Frontier
Find Deal
Sun, Nov 23 - Wed, Nov 26
Alaska Airlines Logo
9:35 pm - 5:46 amSEA-PHL
5h 11mnonstop
Alaska Airlines Logo
7:06 pm - 10:29 pmPHL-SEA
6h 23mnonstop
$267Alaska Airlines
Find Deal
Sun, Dec 14 - Fri, Jan 9
Frontier Logo
1:01 pm - 4:45 amSEA-PHL
12h 44m1 stop
Frontier Logo
6:00 am - 11:56 amPHL-SEA
8h 56m1 stop
$268Frontier
Find Deal
Fri, Nov 21 - Wed, Nov 26
Frontier Logo
2:54 pm - 5:31 amSEA-PHL
11h 37m1 stop
Frontier Logo
6:40 am - 11:09 amPHL-SEA
31h 29m2 stops
$269Frontier
Find Deal
Mon, Jan 5 - Wed, Jan 14
Frontier Logo
1:25 pm - 5:31 amSEA-PHL
13h 06m1 stop
Frontier Logo
4:39 pm - 1:07 pmPHL-SEA
23h 28m1 stop
$270Frontier
Find Deal
Thu, Dec 18 - Fri, Jan 9

Frontier flights from Seattle to Philadelphia

Our best Frontier deals on Seattle to Philadelphia flight tickets
Frontier
Nov 23
SEA12:46 pmSeattle/Tacoma Intl
12h 59m
1 stop
PHL4:45 amPhiladelphia
Dec 3
PHL3:30 pmPhiladelphia
21h 36m
2 stops
SEA10:06 amSeattle/Tacoma Intl
$257
Find similar
Frontier
Nov 24
SEA9:53 pmSeattle/Tacoma Intl
23h 46m
2 stops
PHL12:39 amPhiladelphia
Dec 4
PHL4:12 pmPhiladelphia
19h 34m
1 stop
SEA8:46 amSeattle/Tacoma Intl
$259
Find similar
Frontier
Dec 1
SEA9:53 pmSeattle/Tacoma Intl
37h 28m
2 stops
PHL2:21 pmPhiladelphia
Dec 19
PHL8:36 pmPhiladelphia
19h 00m
1 stop
SEA12:36 pmSeattle/Tacoma Intl
$260
Find similar

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
Feb 27
PHL6:20 pmPhiladelphia
9h 39m
1 stop
SEA12:59 amSeattle/Tacoma Intl
$262
Find similar
United Airlines
Dec 9
SEA7:34 pmSeattle/Tacoma Intl
11h 01m
2 stops
PHL9:35 amPhiladelphia
Dec 14
PHL6:30 amPhiladelphia
8h 17m
1 stop
SEA11:47 amSeattle/Tacoma Intl
$282
Find similar
United Airlines
Feb 23
SEA7:00 amSeattle/Tacoma Intl
7h 14m
1 stop
PHL5:14 pmPhiladelphia
Feb 27
PHL10:35 amPhiladelphia
11h 28m
2 stops
SEA7:03 pmSeattle/Tacoma Intl
$296
Find similar

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 November 13, 2025.
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 12/4

9:44 am-5:53 pm

Nonstop5h 09m

Philadelphia

Sun 12/7

6:54 pm-10:12 pm

Nonstop6h 18m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 11/24

9:53 pm-12:39 am

2 stops23h 46m

Philadelphia

Thu 12/4

4:12 pm-8:46 am

1 stop19h 34m

$259

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 12/1

9:53 pm-2:21 pm

2 stops37h 28m

Philadelphia

Fri 12/19

8:36 pm-12:36 pm

1 stop19h 00m

$260

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 12/28

2:54 pm-5:31 am

1 stop11h 37m

Philadelphia

Sun 1/4

7:10 am-10:11 am

1 stop30h 01m

$261

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/18

1:25 pm-5:31 am

1 stop13h 06m

Philadelphia

Fri 1/9

4:39 pm-1:41 pm

2 stops24h 02m

$265

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 11/23

12:46 pm-4:45 am

1 stop12h 59m

Philadelphia

Wed 11/26

7:40 am-11:56 am

2 stops31h 16m

$266

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 12/14

9:35 pm-5:46 am

Nonstop5h 11m

Philadelphia

Fri 1/9

7:06 pm-10:29 pm

Nonstop6h 23m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 11/21

1:01 pm-4:45 am

1 stop12h 44m

Philadelphia

Wed 11/26

6:00 am-11:56 am

1 stop8h 56m

$268

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 1/5

2:54 pm-5:31 am

1 stop11h 37m

Philadelphia

Wed 1/14

6:40 am-11:09 am

2 stops31h 29m

$269

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/18

1:25 pm-5:31 am

1 stop13h 06m

Philadelphia

Fri 1/9

4:39 pm-1:07 pm

1 stop23h 28m

$270

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 $331, are often lower during this time because this is during the off-season. The month of March is another great option to travel to Philadelphia, with average flight prices from Seattle averaging around $397.

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 $462. 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 $584.

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 at noon. momondo users have found flights departing from Seattle to Philadelphia at noon for as low as $344. 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 $438 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 $378 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.

How have Seattle to Philadelphia flight prices changed over time?

As of November 2025, prices for Seattle to Philadelphia flights are approximately 2% cheaper 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

$191

Fastest flight time

4h 55m

Direct flights

Every day

Airports in Philadelphia

1 airport
The best one-way flight to Philadelphia from Seattle in the past 72 hours is $191. The best round-trip flight deal from Seattle to Philadelphia found on momondo in the last 72 hours is $329.
The fastest flight from Seattle to Philadelphia takes 4h 55m
Direct flights go from Seattle to Philadelphia every day.
There is 1 airport near Philadelphia: 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 4h 55m 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
FrontierPriceFrom $131Free CancellationRating
5.8
3,110 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $138Free CancellationRating
6.3
8,139 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $206Free CancellationRating
7.4
9,017 reviews
Search United Airlines flights
DeltaPriceFrom $221Free CancellationRating
7.9
8,008 reviews
Search Delta flights
Sun Country AirPriceFrom $233Free CancellationRating
6.9
336 reviews
Search Sun Country Air flights
Hawaiian AirlinesPriceFrom $277Free CancellationRating
7.8
2,809 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $277Free CancellationRating
8.0
11,286 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $277Free CancellationRating
7.2
11,051 reviews
Search American Airlines flights
SouthwestPriceFrom $351Free CancellationRating
8.0
4,242 reviews
Search Southwest flights

  • Alaska Airlines Flights From Seattle to Philadelphia

    Alaska Airlines flies from Seattle to Philadelphia around 13 times per week, with 11,282 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Seattle to Philadelphia in the last 72 hours was $277 (round-trip), much lower than the average airfare cost of $542 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 $277 round-trip, depending on your selected dates, with average Hawaiian Airlines deals seen on momondo around $534. Hawaiian Airlines operates 12 flights to Philadelphia from Seattle in an average week. Users have rated it 7.8/10 across 2,809 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
Ocean City
Wildwood Crest
King of Prussia
Cherry Hill
Dewey Beach
Newark
Reading
North Wildwood
Dover
Avalon
Lewes
Stone Harbor
Essington
Vineland
Pottstown
New Castle
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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