Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

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 11/20. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to Philadelphia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
9:20 pm - 5:29 am
SEA
-
PHL
5h 09mnonstop
Delta Logo
7:05 am - 10:01 am
PHL
-
SEA
5h 56mnonstop
$329Delta
Thu, Jul 9 - Mon, Jul 13
American Airlines Logo
12:39 pm - 9:05 pm
SEA
-
PHL
5h 26mnonstop
American Airlines Logo
7:35 pm - 10:56 pm
PHL
-
SEA
6h 21mnonstop
$330American Airlines
Thu, Jul 2 - Sat, Jul 11
Southwest Logo
11:05 pm - 11:15 am
SEA
-
PHL
9h 10m
1 stop
Southwest Logo
2:10 pm - 9:30 pm
PHL
-
SEA
10h 20m
1 stop
$333Southwest
Fri, Sep 4 - Sat, Sep 12
Southwest Logo
5:15 am - 5:55 pm
SEA
-
PHL
9h 40m
1 stop
Southwest Logo
6:10 am - 1:00 pm
PHL
-
SEA
9h 50m
1 stop
$334Southwest
Thu, Sep 3 - Sun, Sep 6
Southwest Logo
10:45 am - 9:05 pm
SEA
-
PHL
7h 20m
1 stop
Southwest Logo
5:00 am - 10:40 am
PHL
-
SEA
8h 40m
1 stop
$336Southwest
Thu, Sep 24 - Sun, Sep 27
Southwest Logo
11:05 pm - 11:15 am
SEA
-
PHL
9h 10m
1 stop
Southwest Logo
12:10 pm - 6:15 pm
PHL
-
SEA
9h 05m
2 stops
$338Southwest
Fri, Sep 4 - Sat, Sep 12
Delta Logo
9:29 pm - 5:40 am
SEA
-
PHL
5h 11mnonstop
Delta Logo
7:00 pm - 11:59 pm
PHL
-
SEA
7h 59m
1 stop
$339Delta
Thu, Aug 6 - Thu, Aug 13
Southwest Logo
10:45 am - 9:05 pm
SEA
-
PHL
7h 20m
1 stop
Southwest Logo
6:20 am - 1:40 pm
PHL
-
SEA
10h 20m
2 stops
$341Southwest
Thu, Sep 24 - Sun, Sep 27
American Airlines Logo
11:56 pm - 9:48 am
SEA
-
PHL
6h 52m
1 stop
American Airlines Logo
7:35 pm - 10:56 pm
PHL
-
SEA
6h 21mnonstop
$343American Airlines
Fri, Jul 3 - Tue, Jul 7
Southwest Logo
5:15 am - 4:00 pm
SEA
-
PHL
7h 45m
1 stop
Southwest Logo
4:35 pm - 9:45 pm
PHL
-
SEA
8h 10m
1 stop
$346Southwest
Thu, Aug 13 - Sun, Aug 16

Frontier flights from Seattle to Philadelphia

Our best Frontier deals on Seattle to Philadelphia flight tickets
Frontier
Jul 29
SEA8:13 pmSeattle/Tacoma Intl
30h 47m
1 stop
PHL6:00 amPhiladelphia
Aug 6
PHL8:37 pmPhiladelphia
15h 40m
1 stop
SEA9:17 amSeattle/Tacoma Intl
$380
Frontier
Jul 3
SEA3:33 pmSeattle/Tacoma Intl
17h 14m
1 stop
PHL11:47 amPhiladelphia
Jul 10
PHL8:37 pmPhiladelphia
15h 40m
1 stop
SEA9:17 amSeattle/Tacoma Intl
$390
Frontier
Jul 31
SEA8:53 pmSeattle/Tacoma Intl
30h 07m
1 stop
PHL6:00 amPhiladelphia
Aug 6
PHL8:37 pmPhiladelphia
15h 40m
1 stop
SEA9:17 amSeattle/Tacoma Intl
$400

American Airlines flights from Seattle to Philadelphia

Our best American Airlines deals on Seattle to Philadelphia flight tickets
American Airlines
Jul 2
SEA12:39 pmSeattle/Tacoma Intl
5h 26m
PHL9:05 pmPhiladelphia
Jul 11
PHL7:35 pmPhiladelphia
6h 21m
SEA10:56 pmSeattle/Tacoma Intl
$330
American Airlines
Jul 3
SEA11:56 pmSeattle/Tacoma Intl
6h 52m
1 stop
PHL9:48 amPhiladelphia
Jul 7
PHL7:35 pmPhiladelphia
6h 21m
SEA10:56 pmSeattle/Tacoma Intl
$343
American Airlines
Jun 24
SEA8:10 amSeattle/Tacoma Intl
5h 24m
PHL4:34 pmPhiladelphia
Jun 29
PHL6:17 pmPhiladelphia
6h 18m
SEA9:35 pmSeattle/Tacoma Intl
$357

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 May 30, 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 7/9

9:20 pm-5:29 am

Nonstop5h 09m

Philadelphia

Mon 7/13

7:05 am-10:01 am

Nonstop5h 56m

$329

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 7/2

12:39 pm-9:05 pm

Nonstop5h 26m

Philadelphia

Sat 7/11

7:35 pm-10:56 pm

Nonstop6h 21m

$330

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 9/4

11:05 pm-11:15 am

1 stop9h 10m

Philadelphia

Sat 9/12

2:10 pm-9:30 pm

1 stop10h 20m

$333

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 9/3

5:15 am-5:55 pm

1 stop9h 40m

Philadelphia

Sun 9/6

6:10 am-1:00 pm

1 stop9h 50m

$334

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 9/24

10:45 am-9:05 pm

1 stop7h 20m

Philadelphia

Sun 9/27

5:00 am-10:40 am

1 stop8h 40m

$336

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 9/4

11:05 pm-11:15 am

1 stop9h 10m

Philadelphia

Sat 9/12

12:10 pm-6:15 pm

2 stops9h 05m

$338

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 8/6

9:29 pm-5:40 am

Nonstop5h 11m

Philadelphia

Thu 8/13

7:00 pm-11:59 pm

1 stop7h 59m

$339

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 9/24

10:45 am-9:05 pm

1 stop7h 20m

Philadelphia

Sun 9/27

6:20 am-1:40 pm

2 stops10h 20m

$341

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 7/3

11:56 pm-9:48 am

1 stop6h 52m

Philadelphia

Tue 7/7

7:35 pm-10:56 pm

Nonstop6h 21m

$343

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 8/13

5:15 am-4:00 pm

1 stop7h 45m

Philadelphia

Sun 8/16

4:35 pm-9:45 pm

1 stop8h 10m

$346

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $328, 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 $432. 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 $546.

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 $452. 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 $418 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 $361 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 May 2026, prices for Seattle to Philadelphia flights are approximately 64% 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

$201

Fastest flight time

4h 58m

Direct flights

Every day

Airports in Philadelphia

1 airport
The best one-way flight to Philadelphia from Seattle in the past 72 hours is $201. The best round-trip flight deal from Seattle to Philadelphia found on momondo in the last 72 hours is $372.
The fastest flight from Seattle to Philadelphia takes 4h 58m
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 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
DeltaPriceFrom $148Free CancellationRating
7.9
8,415 reviews
Search Delta flights
FrontierPriceFrom $149Free CancellationRating
5.6
2,929 reviews
Search Frontier flights
United AirlinesPriceFrom $206Free CancellationRating
7.4
9,769 reviews
Search United Airlines flights
Hawaiian AirlinesPriceFrom $223Free CancellationRating
7.8
2,833 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $257Free CancellationRating
7.9
12,437 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $257Free CancellationRating
7.1
11,644 reviews
Search American Airlines flights
SouthwestPriceFrom $376Free CancellationRating
8.0
4,262 reviews
Search Southwest flights

  • Delta Flights From Seattle to Philadelphia

    Delta flies from Seattle to Philadelphia around 3 times per week, with 8,415 momondo users rating the airline 7.9/10. The cheapest Delta deal from Seattle to Philadelphia in the last 72 hours was $148 (round-trip), much lower than the average airfare cost of $338 for Delta flights on this route.

  • Alaska Airlines Flights From Seattle to Philadelphia

    Alaska Airlines is also a popular choice for this route. Alaska Airlines flight deals for Seattle to Philadelphia start from as low as $257 round-trip, depending on your selected dates, with average Alaska Airlines deals seen on momondo around $496. Alaska Airlines operates 10 flights to Philadelphia from Seattle in an average week. Users have rated it 7.9/10 across 12,437 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
Dewey Beach
Reading
Dover
North Wildwood
Avalon
Lewes
Stone Harbor
Essington
New Castle
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

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
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 6/29
Mon 7/6
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States