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

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

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

Chicago (ORD) was the most common stop: 30% of momondo users choosing 1-stop flights on this route connected there.

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

Flights connecting via Chicago (MDW) have the shortest average one-way travel time: 7h 30m.

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

30 flights are operational weekly from Seattle to Philadelphia as of January 2026. The most popular departure day for this route is Tue, with 20% of flights per week taking off on this day.

What airlines fly to Philadelphia?

Alaska Airlines, Delta and American 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 52% of people opting to fly with this airline when traveling to Philadelphia. Keep in mind that there are 10 different airlines that fly to Philadelphia on a routine basis, so you have a few additional options to choose from.

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

Flights via Detroit (DTW) offer the lowest average round-trip price of $329.

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

As of January 2026, 4 flights take off from Seattle and land in Philadelphia each day. The most common flight departure time for this route is 9:00AM, with 51% of daily flights taking off in the evening.

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

Chicago (ORD) has the shortest average layover time for this route: 1h 15m.

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 8 as of January 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.

$123 Cheap Flights from Seattle to Philadelphia in 2026

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9:25 am - 9:52 pm

SEA

PHL

9h 27m1 stop

6:20 pm - 12:59 am

PHL

SEA

9h 39m1 stop

$257United Airlines

Fri, Feb 6 - Fri, Feb 13

9:19 am - 9:33 pm

SEA

PHL

9h 14m1 stop

3:05 pm - 10:43 pm

PHL

SEA

10h 38m2 stops

$258United Airlines

Fri, Feb 20 - Tue, Feb 24

7:30 pm - 9:37 am

SEA

PHL

11h 07m2 stops

6:30 am - 11:32 am

PHL

SEA

8h 02m1 stop

$262United Airlines

Thu, Jan 29 - Mon, Feb 2

10:57 pm - 7:02 am

SEA

PHL

5h 05mnonstop

6:35 pm - 9:57 pm

PHL

SEA

6h 22mnonstop

$267American Airlines

Thu, Feb 12 - Tue, Feb 17

5:00 am - 5:33 pm

SEA

PHL

9h 33m2 stops

10:10 am - 6:26 pm

PHL

SEA

11h 16m2 stops

$268United Airlines

Wed, Jan 28 - Sat, Jan 31

9:28 am - 11:18 am

SEA

PHL

22h 50m2 stops

5:42 pm - 11:19 am

PHL

SEA

20h 37m1 stop

$274Frontier

Thu, Feb 19 - Sun, Feb 22

1:38 pm - 11:53 pm

SEA

PHL

7h 15m1 stop

6:05 am - 10:42 am

PHL

SEA

7h 37m1 stop

$277Delta

Mon, Feb 9 - Thu, Feb 12

10:57 pm - 7:02 am

SEA

PHL

5h 05mnonstop

6:35 pm - 9:57 pm

PHL

SEA

6h 22mnonstop

$278American Airlines

Mon, Mar 2 - Thu, Mar 5

9:25 am - 9:52 pm

SEA

PHL

9h 27m1 stop

12:55 pm - 7:03 pm

PHL

SEA

9h 08m1 stop

$280United Airlines

Wed, Feb 11 - Thu, Feb 12

8:30 am - 7:59 pm

SEA

PHL

8h 29m1 stop

7:06 pm - 10:29 pm

PHL

SEA

6h 23mnonstop

$281Multiple Airlines

Fri, Jan 30 - Wed, Feb 4

Frontier flights from Seattle to Philadelphia

Our best Frontier deals on Seattle to Philadelphia flight tickets

Frontier

Feb 19

SEA9:28 amSeattle/Tacoma Intl

22h 50m

2 stops

PHL11:18 amPhiladelphia

Feb 22

PHL5:42 pmPhiladelphia

20h 37m

1 stop

SEA11:19 amSeattle/Tacoma Intl

$274

Frontier

Feb 21

SEA1:16 pmSeattle/Tacoma Intl

24h 21m

1 stop

PHL4:37 pmPhiladelphia

Feb 28

PHL11:52 amPhiladelphia

26h 33m

2 stops

SEA11:25 amSeattle/Tacoma Intl

$283

Frontier

Apr 2

SEA2:54 pmSeattle/Tacoma Intl

11h 37m

1 stop

PHL5:31 amPhiladelphia

Apr 12

PHL5:36 pmPhiladelphia

21h 54m

2 stops

SEA12:30 pmSeattle/Tacoma Intl

$320

American Airlines flights from Seattle to Philadelphia

Our best American Airlines deals on Seattle to Philadelphia flight tickets

American Airlines

Feb 12

SEA10:57 pmSeattle/Tacoma Intl

5h 05m

PHL7:02 amPhiladelphia

Feb 17

PHL6:35 pmPhiladelphia

6h 22m

SEA9:57 pmSeattle/Tacoma Intl

$267

American Airlines

Mar 2

SEA10:57 pmSeattle/Tacoma Intl

5h 05m

PHL7:02 amPhiladelphia

Mar 5

PHL6:35 pmPhiladelphia

6h 22m

SEA9:57 pmSeattle/Tacoma Intl

$278

American Airlines

Feb 11

SEA6:12 amSeattle/Tacoma Intl

5h 05m

PHL2:17 pmPhiladelphia

Feb 17

PHL1:38 pmPhiladelphia

12h 26m

1 stop

SEA11:04 pmSeattle/Tacoma Intl

$296

Fly from

Fly to

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 2/6

9:25 am-9:52 pm

1 stop9h 27m

Philadelphia

Fri 2/13

6:20 pm-12:59 am

1 stop9h 39m

$257

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 2/20

9:19 am-9:33 pm

1 stop9h 14m

Philadelphia

Tue 2/24

3:05 pm-10:43 pm

2 stops10h 38m

$258

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 1/29

7:30 pm-9:37 am

2 stops11h 07m

Philadelphia

Mon 2/2

6:30 am-11:32 am

1 stop8h 02m

$262

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/12

10:57 pm-7:02 am

Nonstop5h 05m

Philadelphia

Tue 2/17

6:35 pm-9:57 pm

Nonstop6h 22m

$267

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 1/28

5:00 am-5:33 pm

2 stops9h 33m

Philadelphia

Sat 1/31

10:10 am-6:26 pm

2 stops11h 16m

$268

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 2/19

9:28 am-11:18 am

2 stops22h 50m

Philadelphia

Sun 2/22

5:42 pm-11:19 am

1 stop20h 37m

$274

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 2/9

1:38 pm-11:53 pm

1 stop7h 15m

Philadelphia

Thu 2/12

6:05 am-10:42 am

1 stop7h 37m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 3/2

10:57 pm-7:02 am

Nonstop5h 05m

Philadelphia

Thu 3/5

6:35 pm-9:57 pm

Nonstop6h 22m

$278

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/11

9:25 am-9:52 pm

1 stop9h 27m

Philadelphia

Thu 2/12

12:55 pm-7:03 pm

1 stop9h 08m

$280

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 1/30

8:30 am-7:59 pm

1 stop8h 29m

Philadelphia

Wed 2/4

7:06 pm-10:29 pm

Nonstop6h 23m

$281

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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 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 January is another great option to travel to Philadelphia, with average flight prices from Seattle averaging around $366.

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 $451. 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 $570.

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 $445. 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 $427 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 7% 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 January 2026, prices for Seattle to Philadelphia flights are approximately 9% 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	$188
Fastest flight time	5h 04m
Direct flights	Every day
Airports in Philadelphia	1 airport

The best one-way flight to Philadelphia from Seattle in the past 72 hours is $188. The best round-trip flight deal from Seattle to Philadelphia found on momondo in the last 72 hours is $387.

The fastest flight from Seattle to Philadelphia takes 5h 04m

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

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 04m 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 8 as of January 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 (16.05% of total bookings). The next most popular plane models are Airbus A321neo (14.81%), Boeing 737 MAX 9 (14.81%), and Boeing 737-900 Passenger/BBJ3 (winglets) (14.40%).
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 43% of all bookings. The subsequent popular airlines are Alaska Airlines at 36%, Delta at 8%, and Hawaiian Airlines at 4%.

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 Airlines	PriceFrom $138	Free Cancellation	Rating 6.3 8,288 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $140	Free Cancellation	Rating 5.7 3,061 reviews	Search Frontier flights
United Airlines	PriceFrom $206	Free Cancellation	Rating 7.4 9,141 reviews	Search United Airlines flights
Delta	PriceFrom $219	Free Cancellation	Rating 7.9 8,029 reviews	Search Delta flights
American Airlines	PriceFrom $258	Free Cancellation	Rating 7.2 11,095 reviews	Search American Airlines flights
Hawaiian Airlines	PriceFrom $277	Free Cancellation	Rating 7.8 2,824 reviews	Search Hawaiian Airlines flights
Alaska Airlines	PriceFrom $277	Free Cancellation	Rating 8.0 11,668 reviews	Search Alaska Airlines flights
Southwest	PriceFrom $351	Free Cancellation	Rating 8.0 4,250 reviews	Search Southwest flights

Alaska Airlines Flights From Seattle to Philadelphia
Alaska Airlines flies from Seattle to Philadelphia around 3 times per week, with 11,668 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 $525 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 3 flights to Philadelphia from Seattle in an average week. Users have rated it 7.8/10 across 2,824 reviews.

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Wildwood Crest

Ocean City

King of Prussia

Cherry Hill

Newark

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North Wildwood

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Lewes

Stone Harbor

Essington

Vineland

New Castle

Pottstown

Elkton

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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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 3/8. 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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Frontier flights from Seattle to Philadelphia

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How to get the cheapest flight ticket from Seattle to 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?

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?

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 7% 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 January 2026, prices for Seattle to Philadelphia flights are approximately 9% more expensive when compared to flights at the same time last year.

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

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

What airlines fly to Philadelphia?

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

Chicago (ORD) was the most common stop: 30% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Detroit (DTW) offer the lowest average round-trip price of $329.

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

Flights connecting via Chicago (MDW) have the shortest average one-way travel time: 7h 30m.

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

Chicago (ORD) has the shortest average layover time for this route: 1h 15m.

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

As of January 2026, 4 flights take off from Seattle and land in Philadelphia each day. The most common flight departure time for this route is 9:00AM, with 51% of daily flights taking off in the evening.

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

30 flights are operational weekly from Seattle to Philadelphia as of January 2026. The most popular departure day for this route is Tue, with 20% of flights per week taking off on this day.

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

How far is Seattle/Tacoma Intl to Philadelphia by plane?

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Philadelphia Airport?

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?

What documentation or ID do you need to fly to Philadelphia Airport?

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

Alaska Airlines Flights From Seattle to Philadelphia

Hawaiian Airlines Flights From Seattle to Philadelphia

Traveling to a place near Philadelphia?

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Philadelphia?

Can I find flights from Seattle to Philadelphia with flexible booking policies on momondo?

How can momondo help me find flights 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?

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