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$97+ 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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
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Find cheap flights from Seattle to Philadelphia with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Philadelphia are usually found in January or October, booked 81 days in advance, depart on a Wednesday or Thursday and return on a Thursday

Cheap 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 February 11, 2026.

This CheapOair deal was found by Cheapflights users on 2/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/112:00 pm
SEA
-
PHL
1 stop25h 37m
Frontier
Thu 3/55:47 pm
PHL
-
SEA
1 stop20h 32m
Frontier
Deal found 2/8$241
This Travelocity deal was found by Cheapflights users on 2/9. 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.
Thu 5/146:57 pm
SEA
-
PHL
1 stop7h 37m
Frontier
Mon 5/188:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/9$242
This Orbitz deal was found by Cheapflights users on 2/10. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/156:57 pm
SEA
-
PHL
1 stop7h 37m
Frontier
Sun 5/178:25 pm
PHL
-
SEA
1 stop21h 40m
Frontier
Deal found 2/10$245
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1212:42 pm
SEA
-
PHL
1 stop13h 49m
Frontier
Tue 4/145:05 am
PHL
-
SEA
2 stops31h 22m
Frontier
Deal found 2/9$249
This Mytrip deal was found by Cheapflights users on 2/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1212:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
Thu 3/198:25 pm
PHL
-
SEA
1 stop17h 54m
Frontier
Deal found 2/10$250
This Frontier deal was found by Cheapflights users on 2/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/1312:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
Thu 3/198:25 pm
PHL
-
SEA
1 stop17h 54m
Frontier
Deal found 2/11$252
This CheapOair deal was found by Cheapflights users on 2/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/912:42 pm
SEA
-
PHL
1 stop13h 49m
Frontier
Sun 4/198:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/10$253
This Kiwi.com deal was found by Cheapflights users on 2/11. 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 4/274:20 pm
SEA
-
PHL
2 stops20h 50m
Frontier
Fri 5/18:25 pm
PHL
-
SEA
1 stop16h 02m
Frontier
Deal found 2/11$255
This Mytrip deal was found by Cheapflights users on 2/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/1612:24 pm
SEA
-
PHL
1 stop14h 07m
Frontier
Thu 3/198:25 pm
PHL
-
SEA
1 stop17h 54m
Frontier
Deal found 2/10$256
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Tue 3/37:33 pm
SEA
-
PHL
2 stops11h 51m
Frontier
Thu 3/55:47 pm
PHL
-
SEA
1 stop20h 32m
Frontier
Deal found 2/8$257
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/299:35 pm
SEA
-
PHL
2 stops35h 06m
Frontier
Sat 4/48:25 pm
PHL
-
SEA
1 stop18h 12m
Frontier
Deal found 2/9$259
This Expedia deal was found by Cheapflights users on 2/8. 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.
Sat 4/189:55 pm
SEA
-
PHL
Nonstop5h 10m
Multiple Airlines
Mon 4/208:25 pm
PHL
-
SEA
1 stop16h 02m
Multiple Airlines
Deal found 2/8$264

Find 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 February 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$241
(CheapOair)

One-way from

$97
(Kiwi.com)

Popular in

February

Cheapest in

January

Average price

$557

Good round-trip deal

$297 or less

Good one-way deal

$190 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
High demand for flights, 0% potential price rise
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 February 2026
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

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 February 11, 2026.
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

Tue 3/24

9:55 pm-6:05 am

Nonstop5h 10m

Philadelphia

Tue 3/31

7:25 am-10:30 am

Nonstop6h 05m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/28

9:27 pm-5:44 am

Nonstop5h 17m

Philadelphia

Sat 6/6

6:59 am-9:48 am

Nonstop5h 49m

$277

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 5/21

9:27 pm-5:44 am

Nonstop5h 17m

Philadelphia

Mon 5/25

7:01 pm-11:41 pm

1 stop7h 40m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/15

9:27 pm-5:44 am

Nonstop5h 17m

Philadelphia

Sun 5/17

6:59 am-9:50 am

Nonstop5h 51m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/22

9:27 pm-5:44 am

Nonstop5h 17m

Philadelphia

Sun 5/24

6:59 am-9:50 am

Nonstop5h 51m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 6/3

9:27 pm-5:42 am

Nonstop5h 15m

Philadelphia

Sat 6/6

6:59 am-9:48 am

Nonstop5h 49m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 5/15

9:27 pm-5:44 am

Nonstop5h 17m

Philadelphia

Wed 5/20

6:59 am-9:50 am

Nonstop5h 51m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/20

10:35 pm-9:27 am

1 stop7h 52m

Philadelphia

Sun 5/24

6:59 am-9:50 am

Nonstop5h 51m

$287

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 5/20

10:35 pm-9:27 am

1 stop7h 52m

Philadelphia

Mon 5/25

7:01 pm-11:41 pm

1 stop7h 40m

$297

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 4/29

7:35 pm-5:35 am

1 stop7h 00m

Philadelphia

Fri 5/8

6:59 am-9:50 am

Nonstop5h 51m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/11

Showing 1-10 of 21 results
1
2
3

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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*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.

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 February 6, 2026.

The best time to book flights from Seattle to Philadelphia is 59 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, December is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of $129). Flying from Seattle to Philadelphia in February is currently the most expensive (average of $198). 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 February 11, 2026.

When flying from Seattle to Philadelphia, 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 Seattle to Philadelphia 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 Seattle to Philadelphia 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.

Read more
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.

Read more

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 February 11, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines from Seattle to Philadelphia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,874 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
8.0
Very good
11,874 reviews
Alaska Airlines
8.0
Very good
11,874 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,180 reviews
Alaska Airlines
8.0
Very good
11,874 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Hawaiian Airlines
7.8
Good
2,832 reviews
Alaska Airlines
8.0
Very good
11,874 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
United Airlines
7.4
Good
9,273 reviews
Alaska Airlines
8.0
Very good
11,874 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
American Airlines
7.2
Good
11,265 reviews
Alaska Airlines
8.0
Very good
11,874 reviews

Comfort

7.8

Entertainment

7.0

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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 05m on average. When it comes time to book airfare, you have a few options: there are 2 outbound flights from Seattle/Tacoma Intl to Philadelphia offered by 8 different airlines.

  • How popular is this Seattle to Philadelphia flight route?

    Flights from Seattle/Tacoma Intl to Philadelphia have been viewed 8 times in the past calendar month.

  • How long is the flight from Seattle to Philadelphia?

    Airlines like Alaska Airlines and Delta fly from Seattle to Philadelphia in about 5h 10m. The time it takes to get you to your destination is usually consistent. Seattle and Philadelphia are separated by a distance of 2370 mi. All flights are typically nonstop.

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

    Currently priced at $72, 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 $139 and $153, respectively. Spirit Airlines is currently priced 83% 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 $51 on Spirit Airlines. Other airlines that offer cheap prices include Frontier from $99 and United Airlines from $128 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 Qatar Airways (84%), British Airways (84%) or American Airlines (82%) 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 $247 on average, our data indicates $342 when flying from Seattle to Philadelphia.

  • 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, December is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of $129). Flying from Seattle to Philadelphia in February is currently the most expensive (average of $198). 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 Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
Pottstown
Reading
Ocean City
King of Prussia
Cherry Hill
Lewes
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Glen Mills
Newark

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
Seattle to Dulles Intl flights
Seattle to Reagan-National flights
Portland to John F Kennedy Intl flights
Portland to Newark flights
Portland to LaGuardia flights
Portland to Dulles Intl flights
Portland to Reagan-National flights
Portland to Philadelphia flights
Spokane to John F Kennedy Intl flights
Spokane to Dulles Intl flights
Spokane to Newark flights
Seattle to Pittsburgh flights
Spokane to LaGuardia flights
Spokane to Reagan-National flights
Portland to Pittsburgh flights
Seattle to Harrisburg flights
Pasco to John F Kennedy Intl flights
Pasco to Newark flights
Spokane to Pittsburgh flights
Pasco to LaGuardia flights
Pasco to Dulles Intl flights
Pasco to Philadelphia flights
Pasco to Reagan-National flights
Spokane to Philadelphia flights
Seattle to Scranton flights
Portland to Harrisburg flights
Portland to Allentown flights
Seattle to Allentown flights
Pasco to Harrisburg flights
Spokane to Harrisburg flights
Seattle to State College flights
Pasco to Pittsburgh flights
Portland to State College flights
Pullman to Reagan-National flights
Spokane to Scranton flights
Pullman to Dulles Intl flights
Bellingham to Dulles Intl flights
Yakima to John F Kennedy Intl flights
Portland to Scranton flights
Portland to Elmira flights
Seattle to Elmira flights
Bellingham to Reagan-National flights
Yakima to Reagan-National flights
Walla Walla to John F Kennedy Intl flights
Walla Walla to Newark flights
Yakima to Newark flights

Top 8 airlines flying from Seattle to Philadelphia

Discover the top 8 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 February 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$72Average$258FlexibilityNo cancel feeOn-time65%
FrontierCheapest$139Average$288FlexibilityNo cancel feeOn-time62%
DeltaCheapest$153Average$334FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$206Average$360FlexibilityNo cancel feeOn-time69%
Hawaiian AirlinesCheapest$228Average$510FlexibilityNo cancel feeOn-time85%
American AirlinesCheapest$257Average$401FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$268Average$504FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$351Average$428FlexibilityNo cancel feeOn-time63%

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