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Cheap flights from Seattle to Philadelphia from $123

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 1/9. 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.
United Airlines Logo
8:10 am - 6:54 pm
SEA
-
PHL
7h 44m1 stop
United Airlines Logo
10:30 am - 6:26 pm
PHL
-
SEA
10h 56m2 stops
$262United Airlines
Wed, Jan 7 - Wed, Jan 14
Delta Logo
12:55 am - 10:43 am
SEA
-
PHL
6h 48m1 stop
Delta Logo
2:31 pm - 10:50 pm
PHL
-
SEA
11h 19m1 stop
$267Delta
Wed, Dec 31 - Wed, Jan 7
Frontier Logo
1:09 pm - 3:29 pm
SEA
-
PHL
23h 20m1 stop
Frontier Logo
5:01 pm - 4:36 pm
PHL
-
SEA
26h 35m2 stops
$268Frontier
Thu, Feb 26 - Mon, Mar 9
American Airlines Logo
6:12 am - 2:17 pm
SEA
-
PHL
5h 05mnonstop
American Airlines Logo
12:28 pm - 9:50 pm
PHL
-
SEA
12h 22m1 stop
$271American Airlines
Sat, Jan 10 - Sat, Jan 17
United Airlines Logo
7:00 am - 5:33 pm
SEA
-
PHL
7h 33m1 stop
United Airlines Logo
6:30 am - 3:44 pm
PHL
-
SEA
12h 14m2 stops
$272United Airlines
Wed, Jan 14 - Sat, Jan 17
Hawaiian Airlines Logo
9:54 am - 6:03 pm
SEA
-
PHL
5h 09mnonstop
Hawaiian Airlines Logo
7:06 pm - 10:29 pm
PHL
-
SEA
6h 23mnonstop
$274Hawaiian Airlines
Fri, Jan 23 - Fri, Jan 30
Southwest Logo
6:05 am - 4:20 pm
SEA
-
PHL
7h 15m1 stop
Southwest Logo
5:50 am - 10:50 am
PHL
-
SEA
8h 00m1 stop
$277Southwest
Wed, Feb 25 - Mon, Mar 2
Southwest Logo
6:45 am - 5:05 pm
SEA
-
PHL
7h 20m1 stop
Southwest Logo
1:40 pm - 10:50 pm
PHL
-
SEA
12h 10m2 stops
$282Southwest
Wed, Feb 25 - Mon, Mar 2
Frontier Logo
12:48 pm - 5:31 am
SEA
-
PHL
13h 43m1 stop
Frontier Logo
8:36 pm - 12:30 pm
PHL
-
SEA
18h 54m1 stop
$284Frontier
Sun, Dec 14 - Sat, Dec 20
Frontier Logo
12:19 pm - 4:32 pm
SEA
-
PHL
25h 13m1 stop
Frontier Logo
4:14 pm - 9:36 am
PHL
-
SEA
20h 22m2 stops
$285Frontier
Thu, Jan 15 - Sun, Jan 18

United Airlines flights from Seattle to Philadelphia

Our best United Airlines deals on Seattle to Philadelphia flight tickets
United Airlines
Jan 15
SEA7:00 amSeattle/Tacoma Intl
7h 34m
1 stop
PHL5:34 pmPhiladelphia
Jan 18
PHL6:30 amPhiladelphia
12h 14m
2 stops
SEA3:44 pmSeattle/Tacoma Intl
$262
Find similar
United Airlines
Jan 14
SEA7:00 amSeattle/Tacoma Intl
7h 33m
1 stop
PHL5:33 pmPhiladelphia
Jan 17
PHL6:30 amPhiladelphia
12h 14m
2 stops
SEA3:44 pmSeattle/Tacoma Intl
$272
Find similar
United Airlines
Jan 18
SEA7:00 amSeattle/Tacoma Intl
7h 34m
1 stop
PHL5:34 pmPhiladelphia
Jan 20
PHL10:30 amPhiladelphia
10h 56m
2 stops
SEA6:26 pmSeattle/Tacoma Intl
$289
Find similar

Delta flights from Seattle to Philadelphia

Our best Delta deals on Seattle to Philadelphia flight tickets
Delta
Dec 31
SEA12:55 amSeattle/Tacoma Intl
6h 48m
1 stop
PHL10:43 amPhiladelphia
Jan 7
PHL2:31 pmPhiladelphia
11h 19m
1 stop
SEA10:50 pmSeattle/Tacoma Intl
$267
Find similar
Delta
Feb 20
SEA11:15 pmSeattle/Tacoma Intl
6h 35m
1 stop
PHL8:50 amPhiladelphia
Mar 1
PHL6:50 pmPhiladelphia
8h 19m
1 stop
SEA12:09 amSeattle/Tacoma Intl
$327
Find similar
Delta
Jan 22
SEA1:38 pmSeattle/Tacoma Intl
7h 15m
1 stop
PHL11:53 pmPhiladelphia
Jan 27
PHL4:59 pmPhiladelphia
9h 16m
1 stop
SEA11:15 pmSeattle/Tacoma Intl
$351
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 December 10, 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

Wed 1/7

8:10 am-6:54 pm

1 stop7h 44m

Philadelphia

Wed 1/14

10:30 am-6:26 pm

2 stops10h 56m

$262

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 12/31

12:55 am-10:43 am

1 stop6h 48m

Philadelphia

Wed 1/7

2:31 pm-10:50 pm

1 stop11h 19m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/26

1:09 pm-3:29 pm

1 stop23h 20m

Philadelphia

Mon 3/9

5:01 pm-4:36 pm

2 stops26h 35m

$268

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 1/10

6:12 am-2:17 pm

Nonstop5h 05m

Philadelphia

Sat 1/17

12:28 pm-9:50 pm

1 stop12h 22m

$271

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 1/14

7:00 am-5:33 pm

1 stop7h 33m

Philadelphia

Sat 1/17

6:30 am-3:44 pm

2 stops12h 14m

$272

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 1/23

9:54 am-6:03 pm

Nonstop5h 09m

Philadelphia

Fri 1/30

7:06 pm-10:29 pm

Nonstop6h 23m

$274

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/25

6:05 am-4:20 pm

1 stop7h 15m

Philadelphia

Mon 3/2

5:50 am-10:50 am

1 stop8h 00m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/25

6:45 am-5:05 pm

1 stop7h 20m

Philadelphia

Mon 3/2

1:40 pm-10:50 pm

2 stops12h 10m

$282

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 12/14

12:48 pm-5:31 am

1 stop13h 43m

Philadelphia

Sat 12/20

8:36 pm-12:30 pm

1 stop18h 54m

$284

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 1/15

12:19 pm-4:32 pm

1 stop25h 13m

Philadelphia

Sun 1/18

4:14 pm-9:36 am

2 stops20h 22m

$285

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 $334, 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 $387.

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 $580.

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 $436 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 $368 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 15% 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 December 2025, prices for Seattle to Philadelphia flights are approximately 26% 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

$213

Fastest flight time

5h 01m

Direct flights

Every day

Airports in Philadelphia

1 airport
The best one-way flight to Philadelphia from Seattle in the past 72 hours is $213. The best round-trip flight deal from Seattle to Philadelphia found on momondo in the last 72 hours is $397.
The fastest flight from Seattle to Philadelphia takes 5h 01m
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 5h 01m 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 $138Free CancellationRating
6.3
8,174 reviews
Search Spirit Airlines flights
FrontierPriceFrom $140Free CancellationRating
5.8
3,085 reviews
Search Frontier flights
DeltaPriceFrom $219Free CancellationRating
7.9
8,007 reviews
Search Delta flights
United AirlinesPriceFrom $221Free CancellationRating
7.4
9,092 reviews
Search United Airlines flights
Sun Country AirPriceFrom $233Free CancellationRating
6.9
333 reviews
Search Sun Country Air flights
American AirlinesPriceFrom $267Free CancellationRating
7.2
11,048 reviews
Search American Airlines flights
Hawaiian AirlinesPriceFrom $277Free CancellationRating
7.8
2,818 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $277Free CancellationRating
8.0
11,423 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $351Free CancellationRating
7.9
4,252 reviews
Search Southwest flights

  • Alaska Airlines Flights From Seattle to Philadelphia

    Alaska Airlines flies from Seattle to Philadelphia around 15 times per week, with 11,423 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 $530 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 15 flights to Philadelphia from Seattle in an average week. Users have rated it 7.8/10 across 2,818 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
Newark
Dewey Beach
Reading
North Wildwood
Avalon
Dover
Lewes
Stone Harbor
Essington
Vineland
Pottstown
Elkton
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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