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

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

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 43% 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.

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: 7h 32m.

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 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.

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

According to our data, American Airlines have had the least number of delays on this route over the last 12 months; with about 17% of their flights experiencing any sort of delay.

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

The number of flights available between Philadelphia and Seattle is 38 per week as of January 2026. The most frequent departure day is Mon, with 16% of weekly flights leaving on this day.

How often are flights from Philadelphia to Seattle delayed?

Historically, on average around 20% 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 149 minutes.

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

Detroit (DTW) has the shortest average layover time for this route: 0h 40m.

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

As of January 2026, 5 flights take off from Philadelphia and land in Seattle each day. The most common flight departure time for this route is 6:00PM, with 100% of daily flights taking off in the evening.

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

Tuesday 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.

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 January 2026.

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.

$98 Cheap Flights from Philadelphia to Seattle in 2026

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Find the cheapest flights from Philadelphia to Seattle

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:58 pm - 10:02 pm

PHL

SEA

6h 04mnonstop

9:27 pm - 5:40 am

SEA

PHL

5h 13mnonstop

$237Alaska Airlines

Sat, May 2 - Wed, May 13

6:35 pm - 9:57 pm

PHL

SEA

6h 22mnonstop

10:57 pm - 7:02 am

SEA

PHL

5h 05mnonstop

$240American Airlines

Sun, Feb 15 - Sat, Feb 21

5:42 pm - 10:55 am

PHL

SEA

20h 13m

1 stop

12:00 pm - 4:37 pm

SEA

PHL

25h 37m

1 stop

$242Frontier

Thu, Feb 19 - Sun, Feb 22

8:25 pm - 9:27 am

PHL

SEA

16h 02m

1 stop

4:20 pm - 5:34 am

SEA

PHL

10h 14m

1 stop

$246Frontier

Tue, Apr 21 - Fri, Apr 24

6:58 pm - 11:53 pm

PHL

SEA

7h 55m

1 stop

9:50 pm - 6:05 am

SEA

PHL

5h 15mnonstop

$247Delta

Fri, May 1 - Sun, May 10

6:47 pm - 9:52 pm

PHL

SEA

6h 05mnonstop

6:57 pm - 5:34 am

SEA

PHL

7h 37m

1 stop

$249Multiple Airlines

Thu, Apr 9 - Wed, Apr 15

6:20 pm - 12:59 am

PHL

SEA

9h 39m

1 stop

7:00 am - 5:14 pm

SEA

PHL

7h 14m

1 stop

$253United Airlines

Thu, Feb 19 - Fri, Feb 20

8:25 pm - 3:05 pm

PHL

SEA

21h 40m

1 stop

9:55 pm - 6:05 am

SEA

PHL

5h 10mnonstop

$254Multiple Airlines

Thu, Apr 16 - Sun, Apr 19

8:25 pm - 9:27 am

PHL

SEA

16h 02m

1 stop

9:27 pm - 5:40 am

SEA

PHL

5h 13mnonstop

$255Multiple Airlines

Mon, May 11 - Fri, May 15

4:59 pm - 11:12 pm

PHL

SEA

9h 13m

1 stop

11:59 pm - 10:45 am

SEA

PHL

7h 46m

1 stop

$257Delta

Fri, Mar 6 - Thu, Mar 26

United Airlines flights from Philadelphia to Seattle

Our best United Airlines deals on Philadelphia to Seattle flight tickets

United Airlines

Feb 19

PHL6:20 pmPhiladelphia

9h 39m

1 stop

SEA12:59 amSeattle/Tacoma Intl

Feb 20

SEA7:00 amSeattle/Tacoma Intl

7h 14m

1 stop

PHL5:14 pmPhiladelphia

$253

United Airlines

Mar 6

PHL5:10 pmPhiladelphia

8h 35m

1 stop

SEA10:45 pmSeattle/Tacoma Intl

Mar 9

SEA11:59 pmSeattle/Tacoma Intl

7h 15m

1 stop

PHL10:14 amPhiladelphia

$257

United Airlines

Feb 19

PHL10:35 amPhiladelphia

11h 28m

2 stops

SEA7:03 pmSeattle/Tacoma Intl

Feb 22

SEA11:59 pmSeattle/Tacoma Intl

7h 25m

1 stop

PHL10:24 amPhiladelphia

$262

Frontier flights from Philadelphia to Seattle

Our best Frontier deals on Philadelphia to Seattle flight tickets

Frontier

Feb 19

PHL5:42 pmPhiladelphia

20h 13m

1 stop

SEA10:55 amSeattle/Tacoma Intl

Feb 22

SEA12:00 pmSeattle/Tacoma Intl

25h 37m

1 stop

PHL4:37 pmPhiladelphia

$242

Frontier

Apr 21

PHL8:25 pmPhiladelphia

16h 02m

1 stop

SEA9:27 amSeattle/Tacoma Intl

Apr 24

SEA6:57 pmSeattle/Tacoma Intl

7h 37m

1 stop

PHL5:34 amPhiladelphia

$246

Frontier

Mar 6

PHL11:00 amPhiladelphia

32h 16m

2 stops

SEA4:16 pmSeattle/Tacoma Intl

Mar 9

SEA12:24 pmSeattle/Tacoma Intl

14h 07m

1 stop

PHL5:31 amPhiladelphia

$260

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 5/2

6:58 pm-10:02 pm

Nonstop6h 04m

Seattle/Tacoma Intl

Wed 5/13

9:27 pm-5:40 am

Nonstop5h 13m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sun 2/15

6:35 pm-9:57 pm

Nonstop6h 22m

Seattle/Tacoma Intl

Sat 2/21

10:57 pm-7:02 am

Nonstop5h 05m

$240

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 2/19

5:42 pm-10:55 am

1 stop20h 13m

Seattle/Tacoma Intl

Sun 2/22

12:00 pm-4:37 pm

1 stop25h 37m

$242

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 4/21

8:25 pm-9:27 am

1 stop16h 02m

Seattle/Tacoma Intl

Fri 4/24

4:20 pm-5:34 am

1 stop10h 14m

$246

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 5/1

6:58 pm-11:53 pm

1 stop7h 55m

Seattle/Tacoma Intl

Sun 5/10

9:50 pm-6:05 am

Nonstop5h 15m

$247

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 4/9

6:47 pm-9:52 pm

Nonstop6h 05m

Seattle/Tacoma Intl

Wed 4/15

6:57 pm-5:34 am

1 stop7h 37m

$249

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 2/19

6:20 pm-12:59 am

1 stop9h 39m

Seattle/Tacoma Intl

Fri 2/20

7:00 am-5:14 pm

1 stop7h 14m

$253

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 4/16

8:25 pm-3:05 pm

1 stop21h 40m

Seattle/Tacoma Intl

Sun 4/19

9:55 pm-6:05 am

Nonstop5h 10m

$254

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Mon 5/11

8:25 pm-9:27 am

1 stop16h 02m

Seattle/Tacoma Intl

Fri 5/15

9:27 pm-5:40 am

Nonstop5h 13m

$255

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 3/6

4:59 pm-11:12 pm

1 stop9h 13m

Seattle/Tacoma Intl

Thu 3/26

11:59 pm-10:45 am

1 stop7h 46m

$257

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 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 $317. 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 $347.

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 Wednesday. momondo users have found tickets for Wednesday departures for as low as $461. 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 $589.

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

Flying to Seattle from Philadelphia in the evening is the least expensive time of day to depart. momondo users have found prices as low as $440 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $514. 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 $407 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 $369 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 January 2026, prices for Philadelphia to Seattle flights are approximately 7% cheaper 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	$208
Fastest flight time	5h 58m
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from Philadelphia in the past 72 hours is $208. The best round-trip flight deal from Philadelphia to Seattle found on momondo in the last 72 hours is $335.

The fastest flight from Philadelphia to Seattle takes 5h 58m

Direct flights go from Philadelphia to Seattle every day.

There is 1 airport in Seattle. From Philadelphia there are direct flights to 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. 5h 58m 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 January 2026.
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 Airbus A321neo, representing 32.48% of all bookings. The subsequent popular models are Airbus A321-100/200 at 24.47%, Boeing 737-900 Passenger/BBJ3 (winglets) at 13.90%, and Boeing 737 MAX 8 at 7.85%.
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 (48% of total bookings). The next most popular airlines are Alaska Airlines (30%), 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 $106	Free Cancellation	Rating 6.3 8,384 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $130	Free Cancellation	Rating 5.7 3,056 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $173	Free Cancellation	Rating 7.8 2,829 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $178	Free Cancellation	Rating 7.9 8,121 reviews	Search Delta flights
Sun Country Air	PriceFrom $211	Free Cancellation	Rating 6.9 343 reviews	Search Sun Country Air flights
Southwest	PriceFrom $236	Free Cancellation	Rating 8.0 4,268 reviews	Search Southwest flights
Alaska Airlines	PriceFrom $254	Free Cancellation	Rating 8.0 11,798 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $272	Free Cancellation	Rating 7.4 9,207 reviews	Search United Airlines flights
American Airlines	PriceFrom $277	Free Cancellation	Rating 7.2 11,198 reviews	Search American Airlines flights

Alaska Airlines Flights From Philadelphia to Seattle
Alaska Airlines flies from Philadelphia to Seattle around 3 times per week, with 11,799 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Philadelphia to Seattle in the last 72 hours was $254 (round-trip), much lower than the average airfare cost of $474 for Alaska Airlines flights on this route.
Hawaiian Airlines Flights From Philadelphia to Seattle
Hawaiian Airlines (7.8/10 from 2,829 reviews) operates around 7 flights from Philadelphia to Seattle in any given week. The average Hawaiian Airlines airfare for this route is around $461, with deals from around $173 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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Kent

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Tumwater

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.

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Cheap flights from Philadelphia to Seattle from $98

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 2/25. 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

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

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

Delta and United 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 20% 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 149 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?

Tuesday 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, American Airlines have had the least number of delays on this route over the last 12 months; with about 17% of their flights experiencing any sort of delay.

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: 7h 32m.

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

Detroit (DTW) has the shortest average layover time for this route: 0h 40m.

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

As of January 2026, 5 flights take off from Philadelphia and land in Seattle each day. The most common flight departure time for this route is 6:00PM, with 100% 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 38 per week as of January 2026. The most frequent departure day is Mon, with 16% 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?

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