Seattle

$142+ 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 4/16. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SEA
Feb 10 — Feb 171
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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 January, booked 71 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap 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 11, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$237
(Alaska Airlines)

One-way from

$141
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$342

Good round-trip deal

$357 or less

Good one-way deal

$245 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 ($65 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.

Find 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 11, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/9. 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.
Wed 5/67:22 amPHL - SEA
Nonstop5h 58mAlaska Airlines
Fri 5/159:27 pmSEA - PHL
Nonstop5h 13mAlaska Airlines
Deal found 1/9$237
This American Airlines deal was found by Cheapflights users on 1/10. 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.
Sat 1/316:50 pmPHL - SEA
Nonstop6h 17mAmerican Airlines
Fri 2/66:12 amSEA - PHL
Nonstop5h 05mAmerican Airlines
Deal found 1/10$238
This Delta deal was found by Cheapflights users on 1/10. 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 5/86:40 pmPHL - SEA
1 stop8h 21mDelta
Tue 5/129:50 pmSEA - PHL
Nonstop5h 15mDelta
Deal found 1/10$247
This Kiwi.com deal was found by Cheapflights users on 1/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/268:25 pmPHL - SEA
1 stop17h 54mFrontier
Mon 4/62:54 pmSEA - PHL
1 stop11h 37mFrontier
Deal found 1/8$248
This Kiwi.com deal was found by Cheapflights users on 1/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/111:00 amPHL - SEA
2 stops28h 30mFrontier
Mon 4/62:54 pmSEA - PHL
1 stop11h 37mFrontier
Deal found 1/10$249
This United Airlines deal was found by Cheapflights users on 1/9. 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 2/176:27 amPHL - SEA
1 stop8h 22mUnited Airlines
Thu 2/199:19 amSEA - PHL
1 stop9h 14mUnited Airlines
Deal found 1/9$253
This Travelocity deal was found by Cheapflights users on 1/9. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/46:20 pmPHL - SEA
Nonstop6h 13mMultiple Airlines
Mon 3/912:24 pmSEA - PHL
1 stop14h 07mMultiple Airlines
Deal found 1/9$254
This Kiwi.com deal was found by Cheapflights users on 1/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/236:47 pmPHL - SEA
Nonstop6h 05mAlaska Airlines
Thu 4/29:37 amSEA - PHL
Nonstop5h 10mAlaska Airlines
Deal found 1/8$256
This Delta deal was found by Cheapflights users on 1/9. 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 2/62:30 pmPHL - SEA
1 stop11h 45mDelta
Tue 2/1011:10 pmSEA - PHL
1 stop6h 40mDelta
Deal found 1/9$257
This United Airlines deal was found by Cheapflights users on 1/9. 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.
Sun 2/16:30 amPHL - SEA
1 stop8h 02mUnited Airlines
Mon 2/27:30 pmSEA - PHL
2 stops11h 08mUnited Airlines
Deal found 1/9$262
This Kiwi.com deal was found by Cheapflights users on 1/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/238:25 pmPHL - SEA
2 stops27h 38mFrontier
Mon 4/62:54 pmSEA - PHL
1 stop11h 37mFrontier
Deal found 1/8$264
This Delta deal was found by Cheapflights users on 1/9. 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.
Sun 2/156:10 amPHL - SEA
1 stop7h 45mDelta
Tue 2/1711:05 pmSEA - PHL
1 stop9h 01mDelta
Deal found 1/9$266

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 11, 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

Thu 5/7

6:58 pm-10:02 pm

Nonstop6h 04m

Seattle/Tacoma Intl

Tue 5/19

9:27 pm-5:40 am

Nonstop5h 13m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sun 5/10

7:05 am-10:04 am

Nonstop5h 59m

Seattle/Tacoma Intl

Wed 5/20

9:50 pm-6:05 am

Nonstop5h 15m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Thu 4/16

7:25 am-10:30 am

Nonstop6h 05m

Seattle/Tacoma Intl

Tue 4/21

9:55 pm-6:05 am

Nonstop5h 10m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Sat 5/9

7:22 am-10:20 am

Nonstop5h 58m

Seattle/Tacoma Intl

Sat 5/16

9:27 pm-5:40 am

Nonstop5h 13m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 3/13

6:22 pm-9:35 pm

Nonstop6h 13m

Seattle/Tacoma Intl

Sat 3/21

9:55 pm-6:05 am

Nonstop5h 10m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 4/10

7:25 am-10:30 am

Nonstop6h 05m

Seattle/Tacoma Intl

Sat 4/18

9:55 pm-6:05 am

Nonstop5h 10m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 5/8

6:58 pm-10:02 pm

Nonstop6h 04m

Seattle/Tacoma Intl

Sat 5/16

9:27 pm-5:40 am

Nonstop5h 13m

$237

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 4/24

6:45 pm-11:59 pm

1 stop8h 14m

Seattle/Tacoma Intl

Fri 5/1

11:14 pm-11:34 am

1 stop9h 20m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 2/6

6:37 pm-12:09 am

1 stop8h 32m

Seattle/Tacoma Intl

Mon 2/9

1:38 pm-11:53 pm

1 stop7h 15m

$257

PhiladelphiaSeattle

PHL - SEA

PHLSEA

Philadelphia

Fri 3/6

6:50 pm-12:09 am

1 stop8h 19m

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.

Deals found on 1/9

Showing 1-10 of 21 results
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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
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 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 9, 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 11, 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
Airports
PHL

For quick check-in, verify your airline’s terminal before arriving. Terminals are spread out, and only some are linked by indoor walkways.

SEA

Use the Link light rail for an inexpensive, 40-minute ride from SEA to downtown Seattle. It's accessible via the skybridge from baggage claim.

Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

Mark Chesnut

Mark Chesnut

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.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

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.

Read more

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 11, 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.

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

8.0

Food

7.1

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.

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

8.0

Food

7.1

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.

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

8.0

Food

7.1

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.

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

8.0

Food

7.1

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.

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

8.0

Food

7.1

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.

Boarding

8.1

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

8.0

Food

7.1

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 5h 59m. Alaska Airlines provides one of the quickest options available for as low as $237. The distance between Philadelphia and Seattle is about 2370 mi. Most flights are nonstop.

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

    According to our current data, Spirit Airlines ($106), Frontier ($130), and Delta ($168) offers the cheapest pricing from Philadelphia to Seattle. These flights start at 73% 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 Hawaiian Airlines from $138 one-way.

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

    Consider Alaska Airlines (68%), Hawaiian Airlines (58%) or Air Tahiti Nui (58%) 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 $1,124, 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 $227 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 $48 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 $49 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
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
Marysville
Fife
Aberdeen
Shoreline
Centralia
Federal Way
Chehalis
Tumwater

Browse thousands of different options on Cheapflights for your next trip

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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 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$115Average$249FlexibilityNo cancel feeOn-time65%
FrontierCheapest$134Average$295FlexibilityNo cancel feeOn-time62%
DeltaCheapest$223Average$362FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$236Average$451FlexibilityNo cancel feeOn-time63%
Sun Country AirCheapest$238Average$365FlexibilityNo cancel feeOn-time83%
Hawaiian AirlinesCheapest$257Average$474FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$263Average$484FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$276Average$449FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$277Average$435FlexibilityNo cancel feeOn-time71%

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