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Cheap flights from Seattle to Philadelphia from $149

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 10/14. 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 Seattle to Philadelphia

Cheap round-trip flights

Delta Logo
7:12 pm - 5:55 amSEA-PHL
7h 43m1 stop
Delta Logo
7:10 am - 2:54 pmPHL-SEA
10h 44m1 stop
$277Delta
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Thu, Nov 20 - Mon, Nov 24
Alaska Airlines Logo
9:23 pm - 5:40 amSEA-PHL
5h 17mnonstop
Alaska Airlines Logo
7:00 am - 9:49 amPHL-SEA
5h 49mnonstop
$279Alaska Airlines
Find Deal
Mon, Oct 13 - Wed, Oct 15
Frontier Logo
7:00 am - 1:50 pmSEA-PHL
27h 50m2 stops
Frontier Logo
7:10 pm - 7:33 amPHL-SEA
39h 23m2 stops
$280Frontier
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Tue, Sep 30 - Sat, Oct 11
Frontier Logo
10:16 am - 6:44 pmSEA-PHL
29h 28m2 stops
Frontier Logo
5:20 am - 12:07 pmPHL-SEA
33h 47m2 stops
$283Frontier
Find Deal
Mon, Oct 13 - Mon, Oct 20
Alaska Airlines Logo
9:35 pm - 5:46 amSEA-PHL
5h 11mnonstop
Alaska Airlines Logo
6:35 pm - 9:47 pmPHL-SEA
6h 12mnonstop
$287Alaska Airlines
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Mon, Dec 15 - Sun, Feb 1
Hawaiian Airlines Logo
9:45 am - 6:11 pmSEA-PHL
5h 26mnonstop
Hawaiian Airlines Logo
7:11 pm - 10:29 pmPHL-SEA
6h 18mnonstop
$291Hawaiian Airlines
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Wed, Oct 22 - Wed, Oct 22
American Airlines Logo
12:41 am - 12:46 pmSEA-PHL
9h 05m1 stop
American Airlines Logo
6:50 pm - 10:20 pmPHL-SEA
6h 30mnonstop
$307American Airlines
Find Deal
Tue, Nov 4 - Sun, Nov 9
American Airlines Logo
12:59 am - 11:28 amSEA-PHL
7h 29m1 stop
American Airlines Logo
6:45 pm - 10:10 pmPHL-SEA
6h 25mnonstop
$317American Airlines
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Wed, Nov 19 - Mon, Nov 24
Delta Logo
7:11 pm - 5:50 amSEA-PHL
7h 39m1 stop
Delta Logo
4:58 pm - 11:58 pmPHL-SEA
10h 00m1 stop
$318Delta
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Thu, Dec 11 - Tue, Dec 16
Hawaiian Airlines Logo
9:45 am - 5:54 pmSEA-PHL
5h 09mnonstop
Hawaiian Airlines Logo
6:54 pm - 10:12 pmPHL-SEA
6h 18mnonstop
$341Hawaiian Airlines
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Thu, Dec 11 - Thu, Dec 11

Frontier flights from Seattle to Philadelphia

Our best Frontier deals on Seattle to Philadelphia flight tickets
Frontier
Sep 30
SEA7:00 amSeattle/Tacoma Intl
27h 50m
2 stops
PHL1:50 pmPhiladelphia
Oct 11
PHL7:10 pmPhiladelphia
39h 23m
2 stops
SEA7:33 amSeattle/Tacoma Intl
$280
Find similar
Frontier
Sep 26
SEA6:12 amSeattle/Tacoma Intl
15h 45m
1 stop
PHL12:57 amPhiladelphia
Sep 29
PHL1:02 pmPhiladelphia
14h 28m
2 stops
SEA12:30 amSeattle/Tacoma Intl
$281
Find similar
Frontier
Oct 13
SEA10:16 amSeattle/Tacoma Intl
29h 28m
2 stops
PHL6:44 pmPhiladelphia
Oct 20
PHL5:20 amPhiladelphia
33h 47m
2 stops
SEA12:07 pmSeattle/Tacoma Intl
$283
Find similar

JetBlue flights from Seattle to Philadelphia

Our best JetBlue deals on Seattle to Philadelphia flight tickets
JetBlue
Oct 1
SEA11:45 amSeattle/Tacoma Intl
18h 37m
1 stop
PHL9:22 amPhiladelphia
Oct 21
PHL3:31 pmPhiladelphia
23h 28m
1 stop
SEA11:59 amSeattle/Tacoma Intl
$318
Find similar
JetBlue
Sep 30
SEA11:30 amSeattle/Tacoma Intl
24h 30m
1 stop
PHL3:00 pmPhiladelphia
Oct 4
PHL7:00 amPhiladelphia
30h 34m
1 stop
SEA10:34 amSeattle/Tacoma Intl
$386
Find similar
JetBlue
Sep 24
SEA11:30 amSeattle/Tacoma Intl
24h 30m
1 stop
PHL3:00 pmPhiladelphia
Oct 1
PHL10:20 amPhiladelphia
27h 14m
1 stop
SEA10:34 amSeattle/Tacoma Intl
$408
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 September 17, 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 11/20

7:12 pm-5:55 am

1 stop7h 43m

Philadelphia

Mon 11/24

7:10 am-2:54 pm

1 stop10h 44m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 10/13

9:23 pm-5:40 am

Nonstop5h 17m

Philadelphia

Wed 10/15

7:00 am-9:49 am

Nonstop5h 49m

$279

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 9/30

7:00 am-1:50 pm

2 stops27h 50m

Philadelphia

Sat 10/11

7:10 pm-7:33 am

2 stops39h 23m

$280

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 10/13

10:16 am-6:44 pm

2 stops29h 28m

Philadelphia

Mon 10/20

5:20 am-12:07 pm

2 stops33h 47m

$283

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 12/15

9:35 pm-5:46 am

Nonstop5h 11m

Philadelphia

Sun 2/1

6:35 pm-9:47 pm

Nonstop6h 12m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 10/22

9:45 am-6:11 pm

Nonstop5h 26m

Philadelphia

Wed 10/22

7:11 pm-10:29 pm

Nonstop6h 18m

$291

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 11/4

12:41 am-12:46 pm

1 stop9h 05m

Philadelphia

Sun 11/9

6:50 pm-10:20 pm

Nonstop6h 30m

$307

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 11/19

12:59 am-11:28 am

1 stop7h 29m

Philadelphia

Mon 11/24

6:45 pm-10:10 pm

Nonstop6h 25m

$317

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

7:11 pm-5:50 am

1 stop7h 39m

Philadelphia

Tue 12/16

4:58 pm-11:58 pm

1 stop10h 00m

$318

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 12/11

9:45 am-5:54 pm

Nonstop5h 09m

Philadelphia

Thu 12/11

6:54 pm-10:12 pm

Nonstop6h 18m

$341

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 March. Flight prices, which tend to average around $387, 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 $402.

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 $460. 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 $590.

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 $450 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 $362 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?

No. A direct flight is the cheapest option for a flight between Seattle to Philadelphia.

How have Seattle to Philadelphia flight prices changed over time?

As of September 2025, prices for Seattle to Philadelphia flights are approximately 1% 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

$198

Fastest flight time

4h 53m

Direct flights

Every day

Airports in Philadelphia

1 airport
The best one-way flight to Philadelphia from Seattle in the past 72 hours is $198. The best round-trip flight deal from Seattle to Philadelphia found on momondo in the last 72 hours is $315.
The fastest flight from Seattle to Philadelphia takes 4h 53m
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 58m 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 $114Free CancellationRating
6.3
8,023 reviews
Search Spirit Airlines flights
FrontierPriceFrom $131Free CancellationRating
5.8
3,173 reviews
Search Frontier flights
United AirlinesPriceFrom $223Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
DeltaPriceFrom $235Free CancellationRating
7.9
7,961 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $277Free CancellationRating
7.8
2,729 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $278Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $278Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $349Free CancellationRating
8.0
4,242 reviews
Search Southwest flights

  • Alaska Airlines Flights From Seattle to Philadelphia

    Alaska Airlines flies from Seattle to Philadelphia around 9 times per week, with 10,000 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Seattle to Philadelphia in the last 72 hours was $278 (round-trip), much lower than the average airfare cost of $537 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 $540. Hawaiian Airlines operates 9 flights to Philadelphia from Seattle in an average week. Users have rated it 7.8/10 across 2,729 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
Dewey Beach
Reading
Newark
Cherry Hill
North Wildwood
Dover
Avalon
Lewes
Stone Harbor
Vineland
Essington
Pottstown
New Castle
West Chester

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.
Start using Trips
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