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Cheap flights from Seattle to Philadelphia from $165

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 9/24. 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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Philadelphia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
9:30 pm - 5:50 am
SEA
-
PHL
5h 20mnonstop
Delta Logo
7:05 am - 9:56 am
PHL
-
SEA
5h 51mnonstop
$329Delta
Thu, Sep 10 - Sun, Sep 13
Frontier Logo
8:13 pm - 12:22 pm
SEA
-
PHL
13h 09m
2 stops
Frontier Logo
11:06 am - 11:04 am
PHL
-
SEA
26h 58m
1 stop
$330Frontier
Wed, Jul 29 - Wed, Aug 12
Frontier Logo
7:06 pm - 5:39 am
SEA
-
PHL
7h 33m
1 stop
Frontier Logo
4:30 pm - 9:04 am
PHL
-
SEA
19h 34m
2 stops
$331Frontier
Thu, Jul 23 - Sat, Aug 8
Frontier Logo
8:53 pm - 7:20 pm
SEA
-
PHL
19h 27m
2 stops
Frontier Logo
8:37 pm - 9:04 am
PHL
-
SEA
15h 27m
1 stop
$332Frontier
Thu, Aug 6 - Sun, Aug 9
Frontier Logo
7:06 pm - 12:22 pm
SEA
-
PHL
14h 16m
2 stops
Frontier Logo
11:06 am - 10:39 am
PHL
-
SEA
26h 33m
1 stop
$333Frontier
Wed, Jul 29 - Sun, Aug 2
Multiple Airlines Logo
7:06 pm - 5:39 am
SEA
-
PHL
7h 33m
1 stop
Multiple Airlines Logo
7:00 am - 9:51 am
PHL
-
SEA
5h 51mnonstop
$334Multiple Airlines
Sun, Sep 6 - Sat, Sep 26
Frontier Logo
7:06 pm - 5:39 am
SEA
-
PHL
7h 33m
1 stop
Frontier Logo
4:30 pm - 9:17 am
PHL
-
SEA
19h 47m
2 stops
$335Frontier
Thu, Jul 23 - Wed, Jul 29
Frontier Logo
7:06 pm - 5:39 am
SEA
-
PHL
7h 33m
1 stop
Frontier Logo
8:37 pm - 9:04 am
PHL
-
SEA
15h 27m
1 stop
$336Frontier
Fri, Jul 31 - Mon, Aug 10
Frontier Logo
8:53 pm - 6:00 am
SEA
-
PHL
30h 07m
1 stop
Frontier Logo
11:06 am - 11:04 am
PHL
-
SEA
26h 58m
1 stop
$337Frontier
Sun, Aug 2 - Tue, Aug 11
Frontier Logo
7:06 pm - 5:39 am
SEA
-
PHL
7h 33m
1 stop
Frontier Logo
1:32 pm - 9:17 am
PHL
-
SEA
22h 45m
2 stops
$338Frontier
Fri, Jul 24 - Sat, Aug 1

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Frontier flights from Seattle to Philadelphia

Our best Frontier deals on Seattle to Philadelphia flight tickets
Frontier
Jul 8
SEA7:06 pmSeattle/Tacoma Intl
13h 43m
1 stop
PHL11:49 amPhiladelphia
Jul 16
PHL8:37 pmPhiladelphia
15h 40m
1 stop
SEA9:17 amSeattle/Tacoma Intl
$329
Frontier
Jul 29
SEA8:13 pmSeattle/Tacoma Intl
13h 09m
2 stops
PHL12:22 pmPhiladelphia
Aug 12
PHL11:06 amPhiladelphia
26h 58m
1 stop
SEA11:04 amSeattle/Tacoma Intl
$330
Frontier
Jul 23
SEA7:06 pmSeattle/Tacoma Intl
7h 33m
1 stop
PHL5:39 amPhiladelphia
Aug 8
PHL4:30 pmPhiladelphia
19h 34m
2 stops
SEA9:04 amSeattle/Tacoma Intl
$331

Southwest flights from Seattle to Philadelphia

Our best Southwest deals on Seattle to Philadelphia flight tickets
Southwest
Aug 28
SEA7:00 amSeattle/Tacoma Intl
11h 05m
2 stops
PHL9:05 pmPhiladelphia
Sep 12
PHL6:30 amPhiladelphia
10h 50m
2 stops
SEA2:20 pmSeattle/Tacoma Intl
$340
Southwest
Aug 17
SEA11:00 pmSeattle/Tacoma Intl
11h 05m
1 stop
PHL1:05 pmPhiladelphia
Aug 25
PHL7:55 amPhiladelphia
10h 35m
2 stops
SEA3:30 pmSeattle/Tacoma Intl
$341
Southwest
Dec 10
SEA6:35 amSeattle/Tacoma Intl
7h 00m
1 stop
PHL4:35 pmPhiladelphia
Dec 13
PHL7:30 amPhiladelphia
8h 45m
1 stop
SEA1:15 pmSeattle/Tacoma Intl
$343

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 July 2, 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

Cheapest round-trip
Quickest round-trip

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 9/10

9:30 pm-5:50 am

Nonstop5h 20m

Philadelphia

Sun 9/13

7:05 am-9:56 am

Nonstop5h 51m

$329

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 7/29

8:13 pm-12:22 pm

2 stops13h 09m

Philadelphia

Wed 8/12

11:06 am-11:04 am

1 stop26h 58m

$330

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 7/23

7:06 pm-5:39 am

1 stop7h 33m

Philadelphia

Sat 8/8

4:30 pm-9:04 am

2 stops19h 34m

$331

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 8/6

8:53 pm-7:20 pm

2 stops19h 27m

Philadelphia

Sun 8/9

8:37 pm-9:04 am

1 stop15h 27m

$332

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 7/29

7:06 pm-12:22 pm

2 stops14h 16m

Philadelphia

Sun 8/2

11:06 am-10:39 am

1 stop26h 33m

$333

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 9/6

7:06 pm-5:39 am

1 stop7h 33m

Philadelphia

Sat 9/26

7:00 am-9:51 am

Nonstop5h 51m

$334

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 7/23

7:06 pm-5:39 am

1 stop7h 33m

Philadelphia

Wed 7/29

4:30 pm-9:17 am

2 stops19h 47m

$335

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 7/31

7:06 pm-5:39 am

1 stop7h 33m

Philadelphia

Mon 8/10

8:37 pm-9:04 am

1 stop15h 27m

$336

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 8/2

8:53 pm-6:00 am

1 stop30h 07m

Philadelphia

Tue 8/11

11:06 am-11:04 am

1 stop26h 58m

$337

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 7/24

7:06 pm-5:39 am

1 stop7h 33m

Philadelphia

Sat 8/1

1:32 pm-9:17 am

2 stops22h 45m

$338

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 typical price of a round-trip flight between Seattle and Philadelphia?

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 $330, are often lower during this time because this is during the off-season. The month of February is another great option to travel to Philadelphia, with average flight prices from Seattle averaging around $337.

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

The cheapest day to depart from Seattle to Philadelphia is on a Tuesday. Travelers who choose to depart for Philadelphia on a Tuesday will often find tickets for as low as $420. 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 $535.

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 $449. 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 from Seattle 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 $416 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 $366 on momondo.

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

There are 4 cabin classes available to choose from on Seattle 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 July 2026, prices for Seattle to Philadelphia flights are approximately 12% 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

$217

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 $217. The best round-trip flight deal from Seattle to Philadelphia found on momondo in the last 72 hours is $404.
The fastest flight from Seattle to Philadelphia takes 4h 55m
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

Frequently asked questions about flying from Seattle to Philadelphia

  • 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 $149Free CancellationRating
5.6
2,850 reviews
Search Frontier flights
DeltaPriceFrom $158Free CancellationRating
7.8
8,452 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $199Free CancellationRating
7.8
2,825 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $206Free CancellationRating
7.4
9,925 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $257Free CancellationRating
7.9
12,603 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $257Free CancellationRating
7.1
11,771 reviews
Search American Airlines flights
SouthwestPriceFrom $384Free CancellationRating
7.9
4,250 reviews
Search Southwest flights

  • Alaska Airlines Flights From Seattle to Philadelphia

    Alaska Airlines flies from Seattle to Philadelphia around 11 times per week, with 12,605 momondo users rating the airline 7.9/10. The cheapest Alaska Airlines deal from Seattle to Philadelphia in the last 72 hours was $257 (round-trip), much lower than the average airfare cost of $475 for Alaska Airlines flights on this route.

  • Delta Flights From Seattle to Philadelphia

    Delta is also a popular choice for this route. Delta flight deals for Seattle to Philadelphia start from as low as $158 round-trip, depending on your selected dates, with average Delta deals seen on momondo around $358. Delta operates 7 flights to Philadelphia from Seattle in an average week. Users have rated it 7.8/10 across 8,452 reviews.

Traveling to a place near Philadelphia?

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

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

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