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

Charlotte (CLT) has the shortest average layover time for this route: 0h 48m.

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

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 8h 07m.

How often are flights from Philadelphia to Seattle delayed?

Historically, on average around 19% of flights between Philadelphia and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 156 minutes.

What day of the week experiences the fewest flight delays on this route?

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Friday has historically seen more delays on average compared to the rest of the week.

What is the most punctual flight time for Philadelphia to Seattle flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

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

Flights via Denver (DEN) offer the lowest average round-trip price of $272.

Which airline has the best punctuality record on Philadelphia to Seattle flights?

According to our data, Delta have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

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

The number of flights available between Philadelphia and Seattle is 49 per week as of November 2025. The most frequent departure day is Wed, with 18% of weekly flights leaving on this day.

What airlines fly to Seattle?

Alaska Airlines, United Airlines and American Airlines are the top three most popular airlines that fly to Seattle from Philadelphia according to our data. Alaska Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 10 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

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

Alaska Airlines, Frontier, and American Airlines are the most popular carriers operating from Philadelphia to Seattle/Tacoma Intl

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

Denver (DEN) was the most common stop: 38% of momondo users choosing 1-stop flights on this route connected there.

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

As of November 2025, 7 flights take off from Philadelphia and land in Seattle each day. The most common flight departure time for this route is 6:00PM, with 67% of daily flights taking off in the evening.

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

Prices for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport refresh daily.

How many operators does momondo search for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport?

The number of operators available for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport is 9 as of November 2025.

How old do you have to be to fly from Philadelphia Airport to Seattle/Tacoma Intl Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$146 Cheap Flights from Philadelphia to Seattle in 2025/26

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Cheap round-trip flights

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7:06 am - 10:20 amPHL-SEA

6h 14mnonstop

9:44 am - 5:53 pmSEA-PHL

5h 09mnonstop

$257Alaska Airlines

Find Deal

Fri, Dec 5 - Sun, Dec 7

5:10 am - 10:11 amPHL-SEA

32h 01m2 stops

2:54 pm - 5:31 amSEA-PHL

11h 37m1 stop

$258Frontier

Find Deal

Mon, Dec 22 - Sun, Jan 4

5:30 am - 11:53 amPHL-SEA

33h 23m2 stops

12:48 pm - 5:31 amSEA-PHL

13h 43m1 stop

$259Multiple Airlines

Find Deal

Wed, Dec 10 - Sun, Dec 14

12:37 pm - 5:18 pmPHL-SEA

7h 41m1 stop

6:33 pm - 5:40 amSEA-PHL

32h 07m1 stop

$260Multiple Airlines

Find Deal

Thu, Dec 18 - Mon, Dec 22

5:00 pm - 10:43 pmPHL-SEA

8h 43m1 stop

9:19 am - 9:33 pmSEA-PHL

9h 14m1 stop

$262United Airlines

Find Deal

Tue, Feb 17 - Sat, Feb 21

5:25 am - 10:06 amPHL-SEA

31h 41m2 stops

12:48 pm - 5:31 amSEA-PHL

13h 43m1 stop

$264Multiple Airlines

Find Deal

Wed, Dec 3 - Sun, Dec 7

4:12 pm - 8:46 amPHL-SEA

19h 34m1 stop

12:48 pm - 5:31 amSEA-PHL

13h 43m1 stop

$265Frontier

Find Deal

Thu, Dec 4 - Sun, Dec 7

6:57 pm - 11:53 amPHL-SEA

19h 56m2 stops

3:40 pm - 5:31 amSEA-PHL

10h 51m1 stop

$266Frontier

Find Deal

Sat, Dec 6 - Mon, Dec 8

10:00 pm - 10:06 amPHL-SEA

39h 06m2 stops

12:48 pm - 5:31 amSEA-PHL

13h 43m1 stop

$267Frontier

Find Deal

Tue, Dec 9 - Sun, Dec 14

8:36 pm - 12:30 pmPHL-SEA

18h 54m1 stop

2:54 pm - 5:31 amSEA-PHL

11h 37m1 stop

$270Frontier

Find Deal

Sun, Dec 21 - Fri, Jan 2

Frontier flights from Philadelphia to Seattle

Our best Frontier deals on Philadelphia to Seattle flight tickets

Frontier

Dec 22

PHL5:10 amPhiladelphia

32h 01m

2 stops

SEA10:11 amSeattle/Tacoma Intl

Jan 4

SEA2:54 pmSeattle/Tacoma Intl

11h 37m

1 stop

PHL5:31 amPhiladelphia

$258

Find similar

Frontier

Mar 2

PHL6:40 amPhiladelphia

8h 34m

1 stop

SEA12:14 pmSeattle/Tacoma Intl

Mar 6

SEA2:54 pmSeattle/Tacoma Intl

11h 37m

1 stop

PHL5:31 amPhiladelphia

$264

Find similar

Frontier

Dec 4

PHL4:12 pmPhiladelphia

19h 34m

1 stop

SEA8:46 amSeattle/Tacoma Intl

Dec 7

SEA12:48 pmSeattle/Tacoma Intl

13h 43m

1 stop

PHL5:31 amPhiladelphia

$265

Find similar

American Airlines flights from Philadelphia to Seattle

Our best American Airlines deals on Philadelphia to Seattle flight tickets

American Airlines

Dec 6

PHL6:40 pmPhiladelphia

6h 19m

SEA9:59 pmSeattle/Tacoma Intl

Dec 6

SEA12:31 amSeattle/Tacoma Intl

9h 13m

1 stop

PHL12:44 pmPhiladelphia

$301

Find similar

American Airlines

Dec 5

PHL6:35 pmPhiladelphia

6h 15m

SEA9:50 pmSeattle/Tacoma Intl

Dec 7

SEA12:38 amSeattle/Tacoma Intl

7h 52m

1 stop

PHL11:30 amPhiladelphia

$307

Find similar

American Airlines

Nov 24

PHL5:30 amPhiladelphia

11h 24m

1 stop

SEA1:54 pmSeattle/Tacoma Intl

Nov 27

SEA12:59 amSeattle/Tacoma Intl

8h 47m

1 stop

PHL12:46 pmPhiladelphia

$451

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 12/5

7:06 am-10:20 am

Nonstop6h 14m

Seattle/Tacoma Intl

Sun 12/7

9:44 am-5:53 pm

Nonstop5h 09m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Mon 12/22

5:10 am-10:11 am

2 stops32h 01m

Seattle/Tacoma Intl

Sun 1/4

2:54 pm-5:31 am

1 stop11h 37m

$258

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 12/10

5:30 am-11:53 am

2 stops33h 23m

Seattle/Tacoma Intl

Sun 12/14

12:48 pm-5:31 am

1 stop13h 43m

$259

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 12/18

12:37 pm-5:18 pm

1 stop7h 41m

Seattle/Tacoma Intl

Mon 12/22

6:33 pm-5:40 am

1 stop32h 07m

$260

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 2/17

5:00 pm-10:43 pm

1 stop8h 43m

Seattle/Tacoma Intl

Sat 2/21

9:19 am-9:33 pm

1 stop9h 14m

$262

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 12/3

5:25 am-10:06 am

2 stops31h 41m

Seattle/Tacoma Intl

Sun 12/7

12:48 pm-5:31 am

1 stop13h 43m

$264

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 12/4

4:12 pm-8:46 am

1 stop19h 34m

Seattle/Tacoma Intl

Sun 12/7

12:48 pm-5:31 am

1 stop13h 43m

$265

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 12/6

6:57 pm-11:53 am

2 stops19h 56m

Seattle/Tacoma Intl

Mon 12/8

3:40 pm-5:31 am

1 stop10h 51m

$266

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 12/9

10:00 pm-10:06 am

2 stops39h 06m

Seattle/Tacoma Intl

Sun 12/14

12:48 pm-5:31 am

1 stop13h 43m

$267

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sun 12/21

8:36 pm-12:30 pm

1 stop18h 54m

Seattle/Tacoma Intl

Fri 1/2

2:54 pm-5:31 am

1 stop11h 37m

$270

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Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Philadelphia to Seattle

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

Delays

Layovers

Other information

What is the cheapest month to fly to Seattle?

In general, October is the cheapest month to fly from Philadelphia to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $327. If you don’t want to visit Seattle in October, then you should wait until February to fly from Philadelphia, when ticket prices are also cheap, with an average price of $367.

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

On average, the least expensive day to fly to Seattle from Philadelphia is on a Thursday. momondo users have found tickets for Thursday departures for as low as $472. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Philadelphia because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $594.

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

Flying to Seattle from Philadelphia at noon is the least expensive time of day to depart. momondo users have found prices as low as $416 when looking at flights departing at noon. Flights to Seattle are more costly in the morning, with an average ticket price of $526. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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

Fly from Philadelphia to Seattle/Tacoma Intl for the best Philadelphia - Seattle/Tacoma Intl flight prices

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

You are more likely to see cheaper flights to Seattle from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $420 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Philadelphia for as low as $387 on momondo.

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

There are 4 cabin classes available to choose from on Philadelphia to Seattle/Tacoma Intl 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 Philadelphia to Seattle flights?

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

How have Philadelphia to Seattle flight prices changed over time?

As of November 2025, prices for Philadelphia to Seattle flights are approximately 21% more expensive when compared to flights at the same time last year.

When to book flights from Philadelphia to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Philadelphia to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Philadelphia to Seattle (PHL to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Philadelphia to Seattle

Best Price Found	$216
Fastest flight time	5h 57m
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from Philadelphia in the past 72 hours is $216. The best round-trip flight deal from Philadelphia to Seattle found on momondo in the last 72 hours is $365.

The fastest flight from Philadelphia to Seattle takes 5h 57m

Direct flights go from Philadelphia to Seattle every day.

There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

Search flight deals

How far is Philadelphia to Seattle/Tacoma Intl by plane?
The straight-line distance from Philadelphia to Seattle/Tacoma Intl is 2372.3 mi. 6h 14m is a normal flight duration for this route.
When did momondo last update prices for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport refresh daily.
How many operators does momondo search for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport?
The number of operators available for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport is 9 as of November 2025.
How old do you have to be to fly from Philadelphia Airport to Seattle/Tacoma Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Philadelphia to Seattle?
momondo data reveals that the most frequently booked plane model on the route from Philadelphia to Seattle is Boeing 737 MAX 9, representing 34.54% of all bookings. The subsequent popular models are Airbus A321-100/200 at 28.29%, Boeing 737-900 Passenger/BBJ3 (winglets) at 14.51%, and Boeing 737 at 8.34%.
What is the most popular airline from Philadelphia to Seattle?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Philadelphia to Seattle is American Airlines (49% of total bookings). The next most popular airlines are Alaska Airlines (29%), Delta (7%), and Frontier (4%).

Best airlines flying from Philadelphia to Seattle

Compare and see reviews for airlines that fly from Philadelphia to Seattle with momondo

Airline	Rating	Free Cancellation	Price
Spirit Airlines	PriceFrom $127	Free Cancellation	Rating 6.3 8,139 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $130	Free Cancellation	Rating 5.8 3,107 reviews	Search Frontier flights
Delta	PriceFrom $233	Free Cancellation	Rating 7.9 8,011 reviews	Search Delta flights
Sun Country Air	PriceFrom $238	Free Cancellation	Rating 6.9 336 reviews	Search Sun Country Air flights
Hawaiian Airlines	PriceFrom $257	Free Cancellation	Rating 7.8 2,809 reviews	Search Hawaiian Airlines flights
Alaska Airlines	PriceFrom $277	Free Cancellation	Rating 8.0 11,290 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $277	Free Cancellation	Rating 7.2 11,048 reviews	Search American Airlines flights
United Airlines	PriceFrom $286	Free Cancellation	Rating 7.4 9,017 reviews	Search United Airlines flights
Southwest	PriceFrom $294	Free Cancellation	Rating 8.0 4,242 reviews	Search Southwest flights

Alaska Airlines Flights From Philadelphia to Seattle
Alaska Airlines flies from Philadelphia to Seattle around 2 times per week, with 11,290 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Philadelphia to Seattle in the last 72 hours was $277 (round-trip), much lower than the average airfare cost of $490 for Alaska Airlines flights on this route.
Hawaiian Airlines Flights From Philadelphia to Seattle
Hawaiian Airlines (7.8/10 from 2,809 reviews) operates around 14 flights from Philadelphia to Seattle in any given week. The average Hawaiian Airlines airfare for this route is around $474, with deals from around $257 rare but found on momondo. Referenced prices are for round-trip Philadelphia to Seattle flight searches in the last 72 hours.

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Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Philadelphia to Seattle. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. All flights to Seattle from Philadelphia on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Philadelphia to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from Philadelphia. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Philadelphia to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Philadelphia to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Cheap flights from Philadelphia to Seattle from $146

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to Seattle departing on 1/14. 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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How to get the cheapest flight ticket from Philadelphia to Seattle

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 Seattle?

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

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

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

Fly from Philadelphia to Seattle/Tacoma Intl for the best Philadelphia - Seattle/Tacoma Intl flight prices

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

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

There are 4 cabin classes available to choose from on Philadelphia to Seattle/Tacoma Intl 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 Philadelphia to Seattle flights?

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

How have Philadelphia to Seattle flight prices changed over time?

As of November 2025, prices for Philadelphia to Seattle flights are approximately 21% more expensive when compared to flights at the same time last year.

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

Alaska Airlines, Frontier, and American Airlines are the most popular carriers operating from Philadelphia to Seattle/Tacoma Intl

What airlines fly to Seattle?

How often are flights from Philadelphia to Seattle delayed?

Historically, on average around 19% of flights between Philadelphia and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 156 minutes.

What is the most punctual flight time for Philadelphia to Seattle flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Wednesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Friday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Philadelphia to Seattle flights?

According to our data, Delta have had the least number of delays on this route over the last 12 months; with no flights being classified as delayed.

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

Denver (DEN) was the most common stop: 38% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Denver (DEN) offer the lowest average round-trip price of $272.

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

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 8h 07m.

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

Charlotte (CLT) has the shortest average layover time for this route: 0h 48m.

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

As of November 2025, 7 flights take off from Philadelphia and land in Seattle each day. The most common flight departure time for this route is 6:00PM, with 67% of daily flights taking off in the evening.

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

The number of flights available between Philadelphia and Seattle is 49 per week as of November 2025. The most frequent departure day is Wed, with 18% of weekly flights leaving on this day.

When to book flights from Philadelphia to Seattle

Cheap Philadelphia to Seattle (PHL to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Philadelphia to Seattle

Best Price Found

Fastest flight time

Direct flights

Airports in Seattle

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

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

How many operators does momondo search for flights from Philadelphia Airport to Seattle/Tacoma Intl Airport?

How old do you have to be to fly from Philadelphia Airport to Seattle/Tacoma Intl Airport?

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

What is the most popular plane model from Philadelphia to Seattle?

What is the most popular airline from Philadelphia to Seattle?

Best airlines flying from Philadelphia to Seattle

Compare and see reviews for airlines that fly from Philadelphia to Seattle with momondo

Alaska Airlines Flights From Philadelphia to Seattle

Hawaiian Airlines Flights From Philadelphia to Seattle

Traveling to a place near Seattle?

Why use momondo?

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