HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Philadelphia

$141+ Cheap flights from Seattle to Philadelphia (SEA - PHL)

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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
Apr 14 — Apr 211
Mon 4/14
Mon 4/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Philadelphia 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 Seattle/Tacoma Intl to Philadelphia are usually found in March or January, booked 85 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Cheap flight deals from Seattle to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Philadelphia (PHL). 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 April 9, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$299
(Mytrip)

One-way from

$141
(Mytrip)

Popular in

December

Cheapest in

March

Average price

$427

Good round-trip deal

$368 or less

Good one-way deal

$186 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Philadelphia flights.
Search Deals
From Seattle/Tacoma Intl to Philadelphia
Search Deals
One-way flight from Seattle/Tacoma Intl to Philadelphia
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Philadelphia.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Philadelphia.
Search Deals

Find flight deals from Seattle to Philadelphia

Cheapest flights from Seattle to Philadelphia
Explore the most affordable flight options available from Seattle to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 9, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 4/8. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1612:30 pmSEA - PHL
1 stop14h 22mSpirit Airlines
Tue 4/2210:08 pmPHL - SEA
1 stop16h 27mSpirit Airlines
Deal found 4/8$298
This Mytrip deal was found by Cheapflights users on 4/8. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/236:25 amSEA - PHL
1 stop12h 40mFrontier
Fri 5/3012:59 pmPHL - SEA
1 stop8h 16mFrontier
Deal found 4/8$300
This American Airlines deal was found by Cheapflights users on 4/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2010:59 pmSEA - PHL
Nonstop5h 08mAmerican Airlines
Wed 5/286:45 pmPHL - SEA
Nonstop6h 05mAmerican Airlines
Deal found 4/9$305
This Expedia deal was found by Cheapflights users on 4/8. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/19:29 pmSEA - PHL
Nonstop5h 15mMultiple Airlines
Mon 5/512:20 pmPHL - SEA
1 stop15h 24mMultiple Airlines
Deal found 4/8$307
This Delta deal was found by Cheapflights users on 4/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2711:05 pmSEA - PHL
1 stop6h 31mDelta
Sun 8/317:00 amPHL - SEA
1 stop10h 43mDelta
Deal found 4/8$315
This Hawaiian Airlines deal was found by Cheapflights users on 4/8. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/209:30 pmSEA - PHL
Nonstop5h 15mHawaiian Airlines
Sun 9/287:05 amPHL - SEA
Nonstop5h 52mHawaiian Airlines
Deal found 4/8$337
This Southwest deal was found by Cheapflights users on 4/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/218:25 amSEA - PHL
2 stops11h 10mSouthwest
Tue 8/266:30 amPHL - SEA
1 stop7h 40mSouthwest
Deal found 4/9$355
This Alaska Airlines deal was found by Cheapflights users on 4/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/39:29 pmSEA - PHL
Nonstop5h 15mAlaska Airlines
Thu 5/87:04 amPHL - SEA
Nonstop5h 55mAlaska Airlines
Deal found 4/8$366
This United Airlines deal was found by Cheapflights users on 4/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/107:00 amSEA - PHL
2 stops13h 35mUnited Airlines
Wed 5/146:20 pmPHL - SEA
1 stop9h 39mUnited Airlines
Deal found 4/8$412

Cheapflights Fare Finder

Customize your flight search to find flights from Seattle to Philadelphia 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 April 9, 2025.
Use the filters below to find and compare flights from Seattle to Philadelphia that are best for you.

Fly from

Seattle

Fly to

Philadelphia

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 6/12

3:58 pm-6:30 am

2 stops11h 32m

Philadelphia

Mon 6/16

7:35 am-3:03 pm

2 stops34h 28m

$299

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/23

6:25 am-10:05 pm

1 stop12h 40m

Philadelphia

Fri 5/30

12:59 pm-6:15 pm

1 stop8h 16m

$300

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 5/20

10:59 pm-7:07 am

Nonstop5h 08m

Philadelphia

Wed 5/28

6:45 pm-9:50 pm

Nonstop6h 05m

$305

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/1

9:29 pm-5:44 am

Nonstop5h 15m

Philadelphia

Mon 5/5

12:20 pm-12:44 am

1 stop15h 24m

$307

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 8/27

11:05 pm-8:36 am

1 stop6h 31m

Philadelphia

Sun 8/31

7:00 am-2:43 pm

1 stop10h 43m

$315

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 9/20

9:30 pm-5:45 am

Nonstop5h 15m

Philadelphia

Sun 9/28

7:05 am-9:57 am

Nonstop5h 52m

$337

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 8/21

8:25 am-10:35 pm

2 stops11h 10m

Philadelphia

Tue 8/26

6:30 am-11:10 am

1 stop7h 40m

$355

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 7/15

12:20 am-10:47 am

1 stop7h 27m

Philadelphia

Wed 7/16

6:28 pm-12:59 am

1 stop9h 31m

$374

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/8

9:29 pm-5:44 am

Nonstop5h 15m

Philadelphia

Mon 5/12

7:04 am-9:59 am

Nonstop5h 55m

$409

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/7

6:00 am-6:30 am

2 stops21h 30m

$141

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/8

Showing 1-10 of 19 results
1
2

Compare providers for flights from Seattle to Philadelphia

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 Seattle to Philadelphia in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy1 starTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust 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 Seattle-Philadelphia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Philadelphia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Philadelphia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Philadelphia flights, Cheapflights users trust FlightHub the most. FlightHub 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 Seattle-Philadelphia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Seattle to Philadelphia flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Philadelphia trip
Airports
SEA

Plan to arrive at SEA two hours before your flight. Use SEA Spot Saver for security screening appointments to reduce wait times.

Read more about SEAby Brandon Schultz
PHL

For a quick trip to Center City, use SEPTA's Airport Line. It's efficient and faster than other transport options.

Read more about PHLby Mark Chesnut
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

Best time to book a flight from Seattle to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Seattle 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 Seattle to Philadelphia

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Philadelphia. Price data was last updated on April 4, 2025.

The best time to book flights from Seattle to Philadelphia is 85 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 Seattle to Philadelphia?

Currently, August is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of $236). Flying from Seattle to Philadelphia in March is currently the most expensive (average of $295). 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 SEA to PHL?

Find hourly flight availability from Seattle to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 9, 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Philadelphia at noon. If you’re flexible enough to do this you can expect to save up to 53% on your trip compared to booking a flight in the afternoon.

What is the cheapest day to fly from Seattle to Philadelphia?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Philadelphia. Price data was last updated on March 30, 2025.

Travelers seeking maximum savings on their Seattle to Philadelphia flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to Philadelphia

Explore weekly flight availability from Seattle to Philadelphia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 9, 2025.

The most flights from SEA to PHL are scheduled on a Monday (10 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

Temperature in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. 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 Philadelphia. Reviews last updated April 9, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Seattle to Philadelphia. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,847 reviews

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Alaska Airlines
8.0
Very good
9,847 reviews
Alaska Airlines
8.0
Very good
9,847 reviews

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Southwest
8.0
Very good
4,281 reviews
Alaska Airlines
8.0
Very good
9,847 reviews

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Delta
8.0
Very good
7,906 reviews
Alaska Airlines
8.0
Very good
9,847 reviews

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Hawaiian Airlines
7.9
Good
2,361 reviews
Alaska Airlines
8.0
Very good
9,847 reviews

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
United Airlines
7.4
Good
8,633 reviews
Alaska Airlines
8.0
Very good
9,847 reviews

Crew

8.5

Overall

8.0

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Related info for your journey

Find useful and relevant information for your journey from Seattle to Philadelphia. 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 Seattle to Philadelphia?

    To fly from Seattle to Philadelphia, you need to book a flight from Seattle/Tacoma Intl (SEA) to Philadelphia (PHL). Nonstop flights to Philadelphia from Seattle/Tacoma Intl take 5h 06m on average. When it comes time to book airfare, you have a few options: there are 6 outbound flights from Seattle/Tacoma Intl to Philadelphia offered by 9 different airlines.

  • How popular is this Seattle to Philadelphia flight route?

    Flights from Seattle/Tacoma Intl to Philadelphia have been viewed 13 times in the past calendar month.

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

    Currently priced at $299, Spirit Airlines will fly you from Seattle to Philadelphia and back. In addition to Spirit Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and Delta - these airlines can fly you to your destination from $300 and $307, respectively. Spirit Airlines is currently priced 35% below the average price you’ll pay for this route.

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

    One-way options have recently been found by users for as low as $141 on Spirit Airlines. Other airlines that offer cheap prices include Alaska Airlines from $144 and Frontier from $146 one-way.

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

    No one likes to see their flight delayed. When booking a flight from Seattle to Philadelphia consider choosing American Airlines (94%), Alaska Airlines (94%) or Hawaiian Airlines (94%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Seattle to Philadelphia?

    Looking at all options, your cheapest flight can be booked for $138. While the most popular route (Seattle/Tacoma Intl - Philadelphia) can be booked for $215 on average our data indicates $549 when flying from Seattle to Philadelphia.

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

    Flights departing from Seattle and landing in Philadelphia layover in Salt Lake City most frequently.

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

    Temple Square, Abravanel Hall, and Salt Lake Temple are the most popular attractions in Salt Lake City if you're in need of something to do during your layover. Temple Square, Abravanel Hall and Salt Lake Temple are located about 4.7 mi, 4.7 mi, and 4.8 mi, respectively from Salt Lake City if you are interested in checking them out. Those on a layover in Salt Lake City in need of a rental car can book one at Salt Lake City for about $55.

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

    Seattle to Philadelphia flights that have layovers will least frequently stop in Denver.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Philadelphia 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 Seattle to Philadelphia?

    Currently, August is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of $236). Flying from Seattle to Philadelphia in March is currently the most expensive (average of $295). 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
King of Prussia
Vineland
Pottstown
Wildwood
Reading
Cherry Hill
Exton
Ocean City
Essington
Chester
Newark
Middletown
Willow Grove
Millville
Ephrata
Camden
Dewey Beach
West Chester
Malvern
Dover

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 Seattle to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Newark flights
Seattle to John F Kennedy Intl flights
Seattle to LaGuardia flights
Portland to John F Kennedy Intl flights
Seattle to Dulles Intl flights
Portland to Newark flights
Seattle to Reagan-National flights
Portland to Dulles Intl flights
Portland to Reagan-National flights
Portland to LaGuardia flights
Seattle to Pittsburgh flights
Portland to Philadelphia flights
Portland to Pittsburgh flights
Spokane to John F Kennedy Intl flights
Spokane to LaGuardia flights
Spokane to Newark flights
Portland to Harrisburg flights
Spokane to Dulles Intl flights
Spokane to Reagan-National flights
Spokane to Philadelphia flights
Seattle to Harrisburg flights
Seattle to Elmira flights
Pasco to John F Kennedy Intl flights
Pasco to Newark flights
Seattle to Scranton flights
Pasco to LaGuardia flights
Portland to State College flights
Seattle to State College flights
Spokane to Pittsburgh flights
Pasco to Dulles Intl flights
Pasco to Reagan-National flights
Portland to Scranton flights
Bellingham to Reagan-National flights
Pasco to Pittsburgh flights
Seattle to Allentown flights
Pullman to John F Kennedy Intl flights
Pasco to Philadelphia flights
Bellingham to Dulles Intl flights
Portland to Allentown flights
Spokane to Harrisburg flights
Pullman to Newark flights
Bellingham to Newark flights
Bellingham to John F Kennedy Intl flights
Wenatchee to Dulles Intl flights
Spokane to Allentown flights
Pullman to Dulles Intl flights
Wenatchee to Reagan-National flights
Seattle to Erie flights
Bellingham to LaGuardia flights

Top 9 airlines flying from Seattle to Philadelphia

Discover the top 9 airlines that operate flights from Seattle to Philadelphia. 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 April 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$85Average$214FlexibilityNo cancel feeOn-time65%
FrontierCheapest$131Average$249FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$220Average$333FlexibilityNo cancel feeOn-time83%
United AirlinesCheapest$271Average$451FlexibilityNo cancel feeOn-time69%
DeltaCheapest$276Average$397FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$289Average$520FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$302Average$458FlexibilityNo cancel feeOn-time71%
Hawaiian AirlinesCheapest$327Average$542FlexibilityNo cancel feeOn-time85%
SouthwestCheapest$346Average$426FlexibilityNo cancel feeOn-time63%

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.