What is the cheapest airline that flies from Seattle/Tacoma Intl to Philadelphia?

Delta and Southwest are the most popular carriers operating from Seattle/Tacoma Intl to Philadelphia

How many flights depart from Seattle to Philadelphia on average per day?

As of June 2026, 7 flights take off from Seattle and land in Philadelphia each day. The most common flight departure time for this route is 10:00PM, with 49% of daily flights taking off at noon.

Which airport is the most popular layover for flights between Seattle and Philadelphia?

Chicago (ORD) was the most common stop: 25% of momondo users choosing 1-stop flights on this route connected there.

What airlines fly to Philadelphia?

Alaska Airlines, American Airlines and United Airlines are the top three most popular airlines that fly to Philadelphia from Seattle according to our data. Alaska Airlines is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Philadelphia. Keep in mind that there are 8 different airlines that fly to Philadelphia on a routine basis, so you have a few additional options to choose from.

How many flights depart from Seattle to Philadelphia on average per week?

53 flights are operational weekly from Seattle to Philadelphia as of June 2026. The most popular departure day for this route is Wed, with 19% of flights per week taking off on this day.

Which layover airport has the shortest connection time from Seattle to Philadelphia?

Salt Lake City (SLC) has the shortest average layover time for this route: 0h 55m.

Which layover airport has the shortest travel time from Seattle to Philadelphia?

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 7h 06m.

Which layover airport offers the lowest fares from Seattle to Philadelphia?

Flights via Detroit (DTW) offer the lowest average round-trip price of $256.

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?

The number of operators available for flights from Seattle/Tacoma Intl Airport to Philadelphia Airport is 7 as of June 2026.

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.

$165 Cheap Flights from Seattle to Philadelphia in 2026

Q: What is the typical price of a round-trip flight between Seattle and Philadelphia?

Prices are currently low for flights on this route. Typical prices usually range from $378 to $550. The lowest price recently found on this route was $329.

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Find the cheapest flights from Seattle to Philadelphia

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:30 pm - 5:50 am

SEA

PHL

5h 20mnonstop

7:05 am - 9:56 am

PHL

SEA

5h 51mnonstop

$329Delta

Wed, Sep 2 - Fri, Sep 11

7:41 pm - 11:49 am

SEA

PHL

13h 08m

1 stop

12:54 pm - 9:17 am

PHL

SEA

23h 23m

1 stop

$330Frontier

Sat, Jul 4 - Mon, Jul 13

9:27 pm - 5:40 am

SEA

PHL

5h 13mnonstop

8:44 pm - 9:51 am

PHL

SEA

16h 07m

1 stop

$331Multiple Airlines

Mon, Sep 28 - Wed, Oct 7

7:06 pm - 12:22 pm

SEA

PHL

14h 16m

2 stops

8:37 pm - 9:17 am

PHL

SEA

15h 40m

1 stop

$332Frontier

Wed, Jul 29 - Fri, Jul 31

8:13 pm - 6:00 am

SEA

PHL

30h 47m

1 stop

7:33 am - 10:32 am

PHL

SEA

5h 59mnonstop

$333Multiple Airlines

Tue, Jul 21 - Tue, Jul 28

7:06 pm - 5:39 am

SEA

PHL

7h 33m

1 stop

8:30 am - 9:17 am

PHL

SEA

27h 47m

2 stops

$334Frontier

Fri, Jul 17 - Tue, Jul 21

7:06 pm - 5:39 am

SEA

PHL

7h 33m

1 stop

4:30 pm - 9:17 am

PHL

SEA

19h 47m

2 stops

$335Frontier

Thu, Jul 16 - Tue, Jul 21

9:25 pm - 5:40 am

SEA

PHL

5h 15mnonstop

3:25 pm - 10:38 pm

PHL

SEA

10h 13m

1 stop

$336Multiple Airlines

Sun, Oct 11 - Sat, Oct 17

8:53 pm - 6:00 am

SEA

PHL

30h 07m

1 stop

11:06 am - 11:08 am

PHL

SEA

27h 02m

1 stop

$337Frontier

Sun, Jul 5 - Fri, Aug 14

1:45 pm - 12:51 am

SEA

PHL

8h 06m

1 stop

7:05 am - 10:24 am

PHL

SEA

6h 19mnonstop

$338Delta

Thu, Nov 12 - Sun, Nov 15

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Alaska Airlines flights from Seattle to Philadelphia

Our best Alaska Airlines deals on Seattle to Philadelphia flight tickets

Alaska Airlines

Jul 1

SEA8:28 amSeattle/Tacoma Intl

5h 15m

PHL4:43 pmPhiladelphia

Jul 4

PHL7:33 amPhiladelphia

5h 59m

SEA10:32 amSeattle/Tacoma Intl

$337

Alaska Airlines

Aug 30

SEA9:27 pmSeattle/Tacoma Intl

5h 13m

PHL5:40 amPhiladelphia

Sep 8

PHL6:59 pmPhiladelphia

5h 52m

SEA9:51 pmSeattle/Tacoma Intl

$353

Alaska Airlines

Nov 12

SEA8:32 amSeattle/Tacoma Intl

5h 17m

PHL4:49 pmPhiladelphia

Nov 15

PHL4:25 pmPhiladelphia

9h 09m

1 stop

SEA10:34 pmSeattle/Tacoma Intl

$362

Delta flights from Seattle to Philadelphia

Our best Delta deals on Seattle to Philadelphia flight tickets

Delta

Sep 2

SEA9:30 pmSeattle/Tacoma Intl

5h 20m

PHL5:50 amPhiladelphia

Sep 11

PHL7:05 amPhiladelphia

5h 51m

SEA9:56 amSeattle/Tacoma Intl

$329

Delta

Nov 12

SEA1:45 pmSeattle/Tacoma Intl

8h 06m

1 stop

PHL12:51 amPhiladelphia

Nov 15

PHL7:05 amPhiladelphia

6h 19m

SEA10:24 amSeattle/Tacoma Intl

$338

Delta

Sep 2

SEA7:16 amSeattle/Tacoma Intl

9h 42m

1 stop

PHL7:58 pmPhiladelphia

Sep 7

PHL7:05 amPhiladelphia

5h 56m

SEA10:01 amSeattle/Tacoma Intl

$339

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 9/2

9:30 pm-5:50 am

Nonstop5h 20m

Philadelphia

Fri 9/11

7:05 am-9:56 am

Nonstop5h 51m

$329

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 7/4

7:41 pm-11:49 am

1 stop13h 08m

Philadelphia

Mon 7/13

12:54 pm-9:17 am

1 stop23h 23m

$330

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 9/28

9:27 pm-5:40 am

Nonstop5h 13m

Philadelphia

Wed 10/7

8:44 pm-9:51 am

1 stop16h 07m

$331

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 7/29

7:06 pm-12:22 pm

2 stops14h 16m

Philadelphia

Fri 7/31

8:37 pm-9:17 am

1 stop15h 40m

$332

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 7/21

8:13 pm-6:00 am

1 stop30h 47m

Philadelphia

Tue 7/28

7:33 am-10:32 am

Nonstop5h 59m

$333

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 7/17

7:06 pm-5:39 am

1 stop7h 33m

Philadelphia

Tue 7/21

8:30 am-9:17 am

2 stops27h 47m

$334

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 7/16

7:06 pm-5:39 am

1 stop7h 33m

Philadelphia

Tue 7/21

4:30 pm-9:17 am

2 stops19h 47m

$335

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 10/11

9:25 pm-5:40 am

Nonstop5h 15m

Philadelphia

Sat 10/17

3:25 pm-10:38 pm

1 stop10h 13m

$336

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 7/5

8:53 pm-6:00 am

1 stop30h 07m

Philadelphia

Fri 8/14

11:06 am-11:08 am

1 stop27h 02m

$337

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 11/12

1:45 pm-12:51 am

1 stop8h 06m

Philadelphia

Sun 11/15

7:05 am-10:24 am

Nonstop6h 19m

$338

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Layovers

Other information

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 $422. 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 $534.

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 $451. 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 June 2026, prices for Seattle to Philadelphia flights are approximately 26% 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	$214
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 $214. The best round-trip flight deal from Seattle to Philadelphia found on momondo in the last 72 hours is $385.

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).

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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?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Philadelphia Airport is 7 as of June 2026.
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?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Seattle to Philadelphia is Airbus A321-100/200 (38.19% of total bookings). The next most popular plane models are Airbus A321neo (35.82%), Boeing 737-800 (8.56%), and Boeing 737-800 Passenger/BBJ2 (winglets) (4.60%).
What is the most popular airline from Seattle to Philadelphia?
momondo data reveals that the most frequently booked airline on the route from Seattle to Philadelphia is American Airlines, representing 48% of all bookings. The subsequent popular airlines are Alaska Airlines at 36%, Delta at 9%, and United Airlines at 3%.

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
Frontier	PriceFrom $149	Free Cancellation	Rating 5.6 2,867 reviews	Search Frontier flights
Delta	PriceFrom $158	Free Cancellation	Rating 7.8 8,431 reviews	Search Delta flights
United Airlines	PriceFrom $206	Free Cancellation	Rating 7.4 9,879 reviews	Search United Airlines flights
Hawaiian Airlines	PriceFrom $228	Free Cancellation	Rating 7.8 2,826 reviews	Search Hawaiian Airlines flights
Alaska Airlines	PriceFrom $257	Free Cancellation	Rating 7.9 12,565 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $257	Free Cancellation	Rating 7.1 11,750 reviews	Search American Airlines flights
Southwest	PriceFrom $384	Free Cancellation	Rating 7.9 4,242 reviews	Search Southwest flights

Alaska Airlines Flights From Seattle to Philadelphia
Alaska Airlines flies from Seattle to Philadelphia around 10 times per week, with 12,565 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 $481 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 $351. Delta operates 6 flights to Philadelphia from Seattle in an average week. Users have rated it 7.8/10 across 8,431 reviews.

Wildwood

Rehoboth Beach

Cape May

Wildwood Crest

Ocean City

Cherry Hill

King of Prussia

Newark

Reading

Dewey Beach

Dover

North Wildwood

Essington

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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Airports servicing Pennsylvania

Allentown-Bethlehem Airport

Altoona Blair County Airport

Wilkes-Barre Scranton Airport

Bradford Airport

DuBois Jefferson County Airport

Erie Airport

Franklin Chess Lamberton Airport

Williamsport Lycoming County Airport

Johnstown Cambria County Airport

Latrobe Westmoreland County Airport

Lancaster Airport

Harrisburg Airport

Pittsburgh Airport

State College University Park Airport

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 7/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Alaska Airlines flights from Seattle to Philadelphia

Our best Alaska Airlines deals on Seattle to Philadelphia flight tickets

Delta flights from Seattle to Philadelphia

Our best Delta deals on Seattle to Philadelphia flight tickets

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See travel insights to Philadelphia from

How to get the cheapest flight ticket from Seattle to Philadelphia

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

What is the cheapest month to fly to Philadelphia?

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

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

What is the cheapest Seattle/Tacoma Intl to Philadelphia flight route?

How far in advance should I book a flight from Seattle to Philadelphia?

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

How have Seattle to Philadelphia flight prices changed over time?

What is the cheapest airline that flies from Seattle/Tacoma Intl to Philadelphia?

What airlines fly to Philadelphia?

Which airport is the most popular layover for flights between Seattle and Philadelphia?

Which layover airport offers the lowest fares from Seattle to Philadelphia?

Which layover airport has the shortest travel time from Seattle to Philadelphia?

Which layover airport has the shortest connection time from Seattle to Philadelphia?

How many flights depart from Seattle to Philadelphia on average per day?

How many flights depart from Seattle to Philadelphia on average per week?

When to book flights from Seattle to Philadelphia

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

Fastest flight time

Direct flights

Airports in Philadelphia

Frequently asked questions about flying 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

Alaska Airlines Flights From Seattle to Philadelphia

Delta Flights From Seattle to Philadelphia

Traveling to a place near Philadelphia?

Why use momondo?

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Pennsylvania

Fly your favorite airline to Philadelphia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

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List of cabin classes available on flights landing in Philadelphia. Availability may vary depending on flight origin and airline.

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