Seattle

$113+ Cheap flights from Philadelphia to Seattle (PHL - SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SEA
Feb 20 — Feb 271
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Philadelphia to Seattle/Tacoma Intl are usually found in October or February, booked 71 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Philadelphia to Seattle

Cheapest flights from Philadelphia to Seattle
Explore the most affordable flight options available from Philadelphia to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/26:58 pm
PHL
-
SEA
Nonstop6h 04m
Alaska Airlines
Fri 5/89:44 pm
SEA
-
PHL
Nonstop5h 18m
Alaska Airlines
Deal found 1/20$237
This American Airlines deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/136:35 pm
PHL
-
SEA
Nonstop6h 22m
American Airlines
Thu 2/1910:57 pm
SEA
-
PHL
Nonstop5h 05m
American Airlines
Deal found 1/20$239
This CheapOair deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/195:42 pm
PHL
-
SEA
1 stop20h 13m
Frontier
Thu 2/261:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
Deal found 1/21$241
This Delta deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:00 am
PHL
-
SEA
1 stop10h 46m
Delta
Wed 5/139:50 pm
SEA
-
PHL
Nonstop5h 15m
Delta
Deal found 1/20$247
This United Airlines deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/236:20 pm
PHL
-
SEA
1 stop9h 39m
United Airlines
Tue 2/2410:55 am
SEA
-
PHL
1 stop7h 14m
United Airlines
Deal found 1/21$253
This Expedia deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/96:47 pm
PHL
-
SEA
Nonstop6h 05m
Multiple Airlines
Mon 4/139:29 pm
SEA
-
PHL
1 stop28h 44m
Multiple Airlines
Deal found 1/20$255
This Delta deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:00 am
PHL
-
SEA
1 stop10h 46m
Delta
Fri 5/85:45 am
SEA
-
PHL
1 stop9h 02m
Delta
Deal found 1/20$257
This CheapOair deal was found by Cheapflights users on 1/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/138:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Sat 4/186:57 pm
SEA
-
PHL
1 stop7h 37m
Frontier
Deal found 1/20$259
This United Airlines deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/2410:35 am
PHL
-
SEA
2 stops11h 28m
United Airlines
Wed 2/2511:59 pm
SEA
-
PHL
1 stop7h 25m
United Airlines
Deal found 1/21$262
This Delta deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/157:05 am
PHL
-
SEA
Nonstop5h 59m
Delta
Mon 5/257:35 pm
SEA
-
PHL
1 stop7h 08m
Delta
Deal found 1/19$267
This Expedia deal was found by Cheapflights users on 1/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/17:25 am
PHL
-
SEA
Nonstop6h 05m
Multiple Airlines
Sun 4/1212:42 pm
SEA
-
PHL
1 stop13h 49m
Multiple Airlines
Deal found 1/19$269
This Gotogate deal was found by Cheapflights users on 1/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/137:05 pm
PHL
-
SEA
1 stop19h 56m
Frontier
Thu 2/191:16 pm
SEA
-
PHL
1 stop25h 39m
Frontier
Deal found 1/21$273

Find flight deals from Philadelphia to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 21, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$237
(Alaska Airlines)

One-way from

$113
(Trip.com)

Popular in

June

Cheapest in

October

Average price

$356

Good round-trip deal

$331 or less

Good one-way deal

$209 or less
Provider with most accurate pricing for Philadelphia-Seattle/Tacoma Intl flight deals.
Provider most trusted by Cheapflights users for Philadelphia-Seattle/Tacoma Intl flights.
From Philadelphia to Seattle/Tacoma Intl
One-way flight from Philadelphia to Seattle/Tacoma Intl
Highest demand for flights based on searches. 13% potential increase in price ($63 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Average for round-trip flights in January 2026
Price to beat on a round-trip flight from Philadelphia to Seattle/Tacoma Intl.
Price to beat on a one-way flight from Philadelphia to Seattle/Tacoma Intl.

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated January 21, 2026.
Use the filters below to find and compare flights from Philadelphia to Seattle that are best for you.

Fly from

Philadelphia

Fly to

Seattle

Route

Depart

Return

Price

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 2/18

6:35 pm-9:57 pm

Nonstop6h 22m

Seattle/Tacoma Intl

Wed 2/25

10:57 pm-7:02 am

Nonstop5h 05m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 2/13

6:35 pm-9:57 pm

Nonstop6h 22m

Seattle/Tacoma Intl

Mon 2/16

10:57 pm-7:02 am

Nonstop5h 05m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 3/5

6:50 pm-12:09 am

1 stop8h 19m

Seattle/Tacoma Intl

Tue 3/10

6:00 am-6:03 pm

1 stop9h 03m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 3/3

5:00 pm-10:43 pm

1 stop8h 43m

Seattle/Tacoma Intl

Tue 3/10

7:00 am-5:14 pm

1 stop7h 14m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 3/19

6:49 pm-12:03 am

1 stop8h 14m

Seattle/Tacoma Intl

Mon 3/23

7:35 pm-5:41 am

1 stop7h 06m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 2/12

12:55 pm-7:03 pm

1 stop9h 08m

Seattle/Tacoma Intl

Tue 2/17

11:59 pm-10:24 am

1 stop7h 25m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Tue 2/17

6:50 pm-12:09 am

1 stop8h 19m

Seattle/Tacoma Intl

Sun 2/22

11:15 pm-8:50 am

1 stop6h 35m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 4/1

1:27 pm-7:00 pm

1 stop8h 33m

Seattle/Tacoma Intl

Mon 4/20

7:37 pm-8:15 am

1 stop9h 38m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 3/12

6:49 pm-12:01 am

1 stop8h 12m

Seattle/Tacoma Intl

Wed 3/18

6:00 am-4:33 pm

1 stop7h 33m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Wed 2/18

12:55 pm-7:03 pm

1 stop9h 08m

Seattle/Tacoma Intl

Wed 2/25

5:00 am-3:51 pm

1 stop7h 51m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Showing 1-10 of 24 results
1
2
3

Compare providers for flights from Philadelphia to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Philadelphia to Seattle in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Philadelphia-Seattle flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Philadelphia-Seattle flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Philadelphia-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Philadelphia-Seattle flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Philadelphia-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Philadelphia to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Philadelphia with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Philadelphia to Seattle

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

Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to Seattle. Price data was last updated on January 16, 2026.

The best time to book flights from Philadelphia to Seattle is 71 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Philadelphia to Seattle?

Currently, October is the cheapest month in which you can book a flight from Philadelphia to Seattle (average of $148). Flying from Philadelphia to Seattle in July is currently the most expensive (average of $223). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PHL to SEA?

Find hourly flight availability from Philadelphia to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 21, 2026.

When flying from Philadelphia to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

The best insider tips for Philadelphia to Seattle flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Philadelphia to Seattle trip
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

Mark Chesnut is a travel writer and public speaker with more than 30 years of experience. The 2019 winner of the NLGJA Excellence in Travel Writing Award, Mark is the author of the book “Prepare for Departure” and has covered air travel for multiple top consumer and trade media outlets.

Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated January 21, 2026.
Read reviews from past customers who have flown Alaska Airlines, Delta, and Hawaiian Airlines from Philadelphia to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Food

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airports do I use to fly from Philadelphia to Seattle?

    Booking a flight from Philadelphia (PHL) to Seattle/Tacoma Intl (SEA) is your only option if you wish to fly from Philadelphia to Seattle. On a typical day, there are 5 flights from Philadelphia to Seattle/Tacoma Intl, all of which are around 5h 59m for a nonstop flight. You can also purchase a plane ticket from 9 airlines when you book a flight from Philadelphia to Seattle.

  • How popular is this Philadelphia to Seattle flight route?

  • How long is the flight from Philadelphia to Seattle?

    A quick flight from Philadelphia to Seattle can take about 6h 22m. American Airlines provides one of the quickest options available for as low as $237. The distance between Philadelphia and Seattle is about 2370 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Philadelphia to Seattle round-trip?

    According to our current data, Spirit Airlines ($106), Frontier ($130), and Hawaiian Airlines ($173) offers the cheapest pricing from Philadelphia to Seattle. These flights start at 74% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Philadelphia to Seattle one-way?

    One-way options have recently been found by users for as low as $85 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $91 and Delta from $138 one-way.

  • What are the most reliable airlines from Philadelphia to Seattle?

    Consider American Airlines (65%), Qatar Airways (65%) or Alaska Airlines (61%) when booking your flight. These represent the most reliable airlines when flying from Philadelphia to Seattle.

  • What are the cheapest flights from Philadelphia to Seattle?

    While on average a flight from Philadelphia to Seattle is generally $1,015, our data shows the cheapest flight currently is $138. When looking at the most popular route, (Philadelphia - Seattle/Tacoma Intl), you can expect to pay $234 for that flight.

  • Where are the most common layover locations when flying from Philadelphia to Seattle?

  • What are some popular things to do or see while on a layover in Minneapolis?

    Minneapolis Armory, Orpheum Theatre, and State Theatre are the most popular attractions in Minneapolis if you're in need of something to do during your layover. Those on a layover in Minneapolis interested in visiting Minneapolis Armory, Orpheum Theatre, or State Theatre can do so by traveling 7.0 mi, 7.3 mi, and 7.3 mi, respectively from Minneapolis St Paul. Travelers in need of a car in Minneapolis can rent one for about $44 per day.

  • What are some popular points of interest to see during a layover in Denver?

    Most Denver visitors opt to spend their time at Coors Field, 16th Street Mall, and Paramount Theatre. Coors Field, 16th Street Mall and Paramount Theatre are located about 18.4 mi, 18.7 mi, and 18.6 mi, respectively from Denver Intl if you are interested in checking them out. Those looking to explore during their layover in Denver can rent a car from Denver Intl for about $48 per day.

  • Where are the least popular layover locations for Philadelphia to Seattle flights?

  • Can I find deals for flights from Philadelphia to Seattle that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Seattle.

  • Can I find deals for business class flights from Philadelphia to Seattle?

    Yes. Cheapflights offers flight deals from Philadelphia to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Philadelphia to Seattle?

    Currently, October is the cheapest month in which you can book a flight from Philadelphia to Seattle (average of $148). Flying from Philadelphia to Seattle in July is currently the most expensive (average of $223). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Lynnwood
Lacey
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Philadelphia to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

Top 9 airlines flying from Philadelphia to Seattle

Discover the top 9 airlines that operate flights from Philadelphia to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$106Average$237FlexibilityNo cancel feeOn-time65%
FrontierCheapest$130Average$289FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$173Average$463FlexibilityNo cancel feeOn-time85%
DeltaCheapest$178Average$360FlexibilityNo cancel feeOn-timeN/A
Sun Country AirCheapest$211Average$340FlexibilityNo cancel feeOn-time83%
SouthwestCheapest$236Average$448FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$256Average$476FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$276Average$447FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$277Average$435FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.