Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Philadelphia to Seattle from $143

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 10/31. 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 Philadelphia to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:48 am - 1:22 pmPHL-SEA
30h 34m1 stop
Multiple Airlines Logo
3:40 pm - 5:31 amSEA-PHL
10h 51m1 stop
$248Multiple Airlines
Find Deal
Mon, Nov 24 - Fri, Dec 12
Multiple Airlines Logo
7:12 pm - 10:30 pmPHL-SEA
6h 18mnonstop
Multiple Airlines Logo
1:37 pm - 4:49 amSEA-PHL
12h 12m1 stop
$249Multiple Airlines
Find Deal
Thu, Nov 13 - Wed, Nov 19
Alaska Airlines Logo
7:12 pm - 10:30 pmPHL-SEA
6h 18mnonstop
Alaska Airlines Logo
9:30 pm - 5:42 amSEA-PHL
5h 12mnonstop
$250Alaska Airlines
Find Deal
Thu, Nov 13 - Wed, Nov 19
Frontier Logo
6:19 am - 12:13 pmPHL-SEA
8h 54m1 stop
Frontier Logo
12:58 pm - 4:49 amSEA-PHL
12h 51m1 stop
$251Frontier
Find Deal
Fri, Nov 7 - Thu, Nov 13
Frontier Logo
6:19 am - 12:13 pmPHL-SEA
8h 54m1 stop
Frontier Logo
12:58 pm - 4:49 amSEA-PHL
12h 51m1 stop
$252Frontier
Find Deal
Mon, Nov 10 - Thu, Nov 13
Frontier Logo
8:29 am - 12:13 pmPHL-SEA
30h 44m2 stops
Frontier Logo
1:37 pm - 4:49 amSEA-PHL
12h 12m1 stop
$253Frontier
Find Deal
Thu, Nov 13 - Wed, Nov 19
Alaska Airlines Logo
6:54 pm - 10:12 pmPHL-SEA
6h 18mnonstop
Alaska Airlines Logo
9:35 pm - 5:46 amSEA-PHL
5h 11mnonstop
$254Alaska Airlines
Find Deal
Fri, Dec 5 - Fri, Dec 12
American Airlines Logo
6:50 pm - 10:20 pmPHL-SEA
6h 30mnonstop
American Airlines Logo
11:20 pm - 7:18 amSEA-PHL
4h 58mnonstop
$258American Airlines
Find Deal
Thu, Nov 13 - Wed, Nov 19
American Airlines Logo
4:00 pm - 11:07 pmPHL-SEA
10h 07m1 stop
American Airlines Logo
7:00 am - 8:14 pmSEA-PHL
10h 14m1 stop
$296American Airlines
Find Deal
Fri, Feb 27 - Mon, Mar 2
Hawaiian Airlines Logo
6:35 pm - 9:47 pmPHL-SEA
6h 12mnonstop
Hawaiian Airlines Logo
9:15 am - 5:31 pmSEA-PHL
5h 16mnonstop
$297Hawaiian Airlines
Find Deal
Tue, Mar 3 - Wed, Mar 4

American Airlines flights from Philadelphia to Seattle

Our best American Airlines deals on Philadelphia to Seattle flight tickets
American Airlines
Nov 13
PHL6:50 pmPhiladelphia
6h 30m
SEA10:20 pmSeattle/Tacoma Intl
Nov 19
SEA11:20 pmSeattle/Tacoma Intl
4h 58m
PHL7:18 amPhiladelphia
$258
Find similar
American Airlines
Feb 27
PHL4:00 pmPhiladelphia
10h 07m
1 stop
SEA11:07 pmSeattle/Tacoma Intl
Mar 2
SEA7:00 amSeattle/Tacoma Intl
10h 14m
1 stop
PHL8:14 pmPhiladelphia
$296
Find similar
American Airlines
Oct 31
PHL8:09 amPhiladelphia
5h 54m
SEA11:03 amSeattle/Tacoma Intl
Oct 31
SEA11:49 pmSeattle/Tacoma Intl
9h 55m
1 stop
PHL12:44 pmPhiladelphia
$307
Find similar

Southwest flights from Philadelphia to Seattle

Our best Southwest deals on Philadelphia to Seattle flight tickets
Southwest
Jan 28
PHL5:40 amPhiladelphia
13h 20m
2 stops
SEA4:00 pmSeattle/Tacoma Intl
Jan 30
SEA6:05 amSeattle/Tacoma Intl
11h 15m
2 stops
PHL8:20 pmPhiladelphia
$267
Find similar
Southwest
Jan 3
PHL3:25 pmPhiladelphia
9h 10m
1 stop
SEA9:35 pmSeattle/Tacoma Intl
Jan 10
SEA5:15 amSeattle/Tacoma Intl
11h 40m
2 stops
PHL7:55 pmPhiladelphia
$289
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Philadelphia to Seattle 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 October 23, 2025.
Use the filters below to find and compare flights from Philadelphia to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Mon 11/24

9:48 am-1:22 pm

1 stop30h 34m

Seattle/Tacoma Intl

Fri 12/12

3:40 pm-5:31 am

1 stop10h 51m

$248

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 11/13

7:12 pm-10:30 pm

Nonstop6h 18m

Seattle/Tacoma Intl

Wed 11/19

1:37 pm-4:49 am

1 stop12h 12m

$249

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 11/13

7:12 pm-10:30 pm

Nonstop6h 18m

Seattle/Tacoma Intl

Wed 11/19

9:30 pm-5:42 am

Nonstop5h 12m

$250

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 11/7

6:19 am-12:13 pm

1 stop8h 54m

Seattle/Tacoma Intl

Thu 11/13

12:58 pm-4:49 am

1 stop12h 51m

$251

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Mon 11/10

6:19 am-12:13 pm

1 stop8h 54m

Seattle/Tacoma Intl

Thu 11/13

12:58 pm-4:49 am

1 stop12h 51m

$252

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 11/13

8:29 am-12:13 pm

2 stops30h 44m

Seattle/Tacoma Intl

Wed 11/19

1:37 pm-4:49 am

1 stop12h 12m

$253

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 12/5

6:54 pm-10:12 pm

Nonstop6h 18m

Seattle/Tacoma Intl

Fri 12/12

9:35 pm-5:46 am

Nonstop5h 11m

$254

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 11/13

6:50 pm-10:20 pm

Nonstop6h 30m

Seattle/Tacoma Intl

Wed 11/19

11:20 pm-7:18 am

Nonstop4h 58m

$258

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 2/27

4:00 pm-11:07 pm

1 stop10h 07m

Seattle/Tacoma Intl

Mon 3/2

7:00 am-8:14 pm

1 stop10h 14m

$296

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 3/3

6:35 pm-9:47 pm

Nonstop6h 12m

Seattle/Tacoma Intl

Wed 3/4

9:15 am-5:31 pm

Nonstop5h 16m

$297

Flights are sorted by cheapest round-trip flights first.

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

See travel insights to Seattle from

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?

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 $357. If you don’t want to visit Seattle in October, then you should wait until March 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 $471. 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 $527. 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 $423 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 $381 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?

You could potentially save up to 6% on your flight if you consider stops on a Philadelphia to Seattle flight.

How have Philadelphia to Seattle flight prices changed over time?

As of October 2025, prices for Philadelphia to Seattle flights are approximately 9% 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

$160

Fastest flight time

5h 54m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Philadelphia in the past 72 hours is $160. The best round-trip flight deal from Philadelphia to Seattle found on momondo in the last 72 hours is $288.
The fastest flight from Philadelphia to Seattle takes 5h 54m
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 11m 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?

  • 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?

  • 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
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $127Free CancellationRating
6.3
8,098 reviews
Search Spirit Airlines flights
FrontierPriceFrom $128Free CancellationRating
5.8
3,128 reviews
Search Frontier flights
DeltaPriceFrom $234Free CancellationRating
7.9
7,981 reviews
Search Delta flights
Sun Country AirPriceFrom $238Free CancellationRating
6.9
334 reviews
Search Sun Country Air flights
Hawaiian AirlinesPriceFrom $257Free CancellationRating
7.8
2,788 reviews
Search Hawaiian Airlines flights
Alaska AirlinesPriceFrom $277Free CancellationRating
8.0
11,156 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $277Free CancellationRating
7.2
11,028 reviews
Search American Airlines flights
United AirlinesPriceFrom $286Free CancellationRating
7.4
8,991 reviews
Search United Airlines flights
SouthwestPriceFrom $294Free CancellationRating
8.0
4,235 reviews
Search Southwest flights

  • Alaska Airlines Flights From Philadelphia to Seattle

    Alaska Airlines flies from Philadelphia to Seattle around 5 times per week, with 11,155 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 $491 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Philadelphia to Seattle

    Hawaiian Airlines (7.8/10 from 2,788 reviews) operates around 7 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.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Tukwila
Lakewood
Federal Way
Kirkland
Fife
Redmond
Cle Elum
Centralia
Shoreline
Westport

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.

An easier way to manage your Seattle 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
Sat 11/22
Sat 11/29
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States