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$149+ 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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
mar. 13 — mar. 201
jue. 3/13
jue. 3/20
1 adult, Economy
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1. Tell us where you want to go
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The best prices from Seattle/Tacoma Intl to Philadelphia are usually found in March or January, booked 85 days in advance, depart on a Wednesday or Tuesday 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 marzo 8, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$297
(Alaska Airlines)

One-way from

$149
(Southwest)

Popular in

December

Cheapest in

March

Average price

$387

Good round-trip deal

$386 or less

Good one-way deal

$184 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Philadelphia flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Philadelphia flights.
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From Seattle/Tacoma Intl to Philadelphia
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One-way flight from Seattle/Tacoma Intl to Philadelphia
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Highest demand for flights based on searches. 3% potential increase in price ($17 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Philadelphia.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Philadelphia.
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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 marzo 8, 2025.

This Alaska Airlines deal was found by Cheapflights users on 3/7. 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.
mar. 4/229:29 pmSEA - PHL
Nonstop5h 15mAlaska Airlines
mar. 4/296:53 pmPHL - SEA
Nonstop6h 07mAlaska Airlines
Deal found 3/7$297
This CheapOair deal was found by Cheapflights users on 3/7. 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.
vie. 3/216:30 pmSEA - PHL
1 stop23h 34mMultiple Airlines
mar. 3/257:40 pmPHL - SEA
1 stop16h 03mMultiple Airlines
Deal found 3/7$299
This Frontier deal was found by Cheapflights users on 3/7. 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.
vie. 4/181:56 pmSEA - PHL
1 stop12h 35mFrontier
vie. 4/2512:40 pmPHL - SEA
1 stop15h 04mFrontier
Deal found 3/7$300
This Mytrip deal was found by Cheapflights users on 3/6. 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.
lun. 4/212:30 pmSEA - PHL
3 stops38h 40mSpirit Airlines
lun. 4/289:51 amPHL - SEA
2 stops28h 44mSpirit Airlines
Deal found 3/6$301
This American Airlines deal was found by Cheapflights users on 3/7. 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.
lun. 4/2110:59 pmSEA - PHL
Nonstop5h 07mAmerican Airlines
lun. 4/286:46 pmPHL - SEA
Nonstop6h 13mAmerican Airlines
Deal found 3/7$305
This Delta deal was found by Cheapflights users on 3/7. 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.
sáb. 4/266:05 amSEA - PHL
1 stop8h 19mDelta
lun. 4/286:34 pmPHL - SEA
1 stop8h 28mDelta
Deal found 3/7$307
This CheapTickets deal was found by Cheapflights users on 3/7. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/149:54 pmSEA - PHL
Nonstop5h 06mHawaiian Airlines
mié. 4/236:53 pmPHL - SEA
Nonstop6h 07mHawaiian Airlines
Deal found 3/7$321
This Sun Country Air deal was found by Cheapflights users on 3/6. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/2111:59 pmSEA - PHL
1 stop8h 16mSun Country Air
dom. 8/2412:10 pmPHL - SEA
1 stop13h 36mSun Country Air
Deal found 3/6$340
This United Airlines deal was found by Cheapflights users on 3/7. 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.
lun. 4/2111:45 pmSEA - PHL
1 stop7h 53mUnited Airlines
mié. 4/2310:43 amPHL - SEA
2 stops11h 18mUnited Airlines
Deal found 3/7$342
This Southwest deal was found by Cheapflights users on 3/7. 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.
lun. 5/57:20 amSEA - PHL
2 stops12h 25mSouthwest
jue. 5/85:45 pmPHL - SEA
1 stop8h 50mSouthwest
Deal found 3/7$384

Find flights from Seattle to Philadelphia within your budget

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 marzo 8, 2025.

Fly from

Seattle

Fly to

Philadelphia

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

mar. 4/22

9:29 pm-5:44 am

Nonstop5h 15m

Philadelphia

mar. 4/29

6:53 pm-10:00 pm

Nonstop6h 07m

$297

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

vie. 3/21

6:30 pm-9:04 pm

1 stop23h 34m

Philadelphia

mar. 3/25

7:40 pm-8:43 am

1 stop16h 03m

$299

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

vie. 4/18

1:56 pm-5:31 am

1 stop12h 35m

Philadelphia

dom. 4/20

6:40 am-11:56 am

1 stop8h 16m

$300

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

lun. 4/21

2:30 pm-8:10 am

3 stops38h 40m

Philadelphia

lun. 4/28

9:51 am-11:35 am

2 stops28h 44m

$301

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

lun. 4/21

10:59 pm-7:06 am

Nonstop5h 07m

Philadelphia

lun. 4/28

6:46 pm-9:59 pm

Nonstop6h 13m

$305

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

sáb. 4/26

6:05 am-5:24 pm

1 stop8h 19m

Philadelphia

lun. 4/28

6:34 pm-12:02 am

1 stop8h 28m

$307

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

lun. 4/14

9:54 pm-6:00 am

Nonstop5h 06m

Philadelphia

mié. 4/23

6:53 pm-10:00 pm

Nonstop6h 07m

$321

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

jue. 8/21

11:59 pm-11:15 am

1 stop8h 16m

Philadelphia

dom. 8/24

12:10 pm-10:46 pm

1 stop13h 36m

$340

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

lun. 4/21

11:45 pm-10:38 am

1 stop7h 53m

Philadelphia

mié. 4/23

10:43 am-7:01 pm

2 stops11h 18m

$342

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

lun. 5/5

7:20 am-10:45 pm

2 stops12h 25m

Philadelphia

jue. 5/8

5:45 pm-11:35 pm

1 stop8h 50m

$384

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 20 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 March.
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
AranGrantPrice Accuracy3 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust 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

Find out what our experts recommend to make the most of 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

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.

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.

Travel insights for flights from Seattle to Philadelphia

Get recent, data-driven insights about flights from Seattle to Philadelphia including ideal travel times, pricing trends, and more.

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 28, 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 marzo 8, 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 2, 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.

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 marzo 8, 2025.
Read reviews from past customers who have flown Southwest, Alaska Airlines 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.
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Food

7.1

Crew

8.7

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest
8.1
Very good
4,314 reviews
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Food

7.1

Crew

8.7

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Alaska Airlines
8.0
Very good
9,716 reviews
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Food

7.1

Crew

8.7

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta
8.0
Very good
8,024 reviews
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Food

7.1

Crew

8.7

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Hawaiian Airlines
7.9
Good
2,316 reviews
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Food

7.1

Crew

8.7

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines
7.4
Good
8,649 reviews
Southwest
8.1
Very good
4,314 reviews

Boarding

8.2

Overall

8.1

Food

7.1

Crew

8.7

Comfort

8.1

Entertainment

7.6

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 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 13 times in the past calendar month.

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

    Currently priced at $297, Alaska Airlines will fly you from Seattle to Philadelphia and back. In addition to Alaska Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and Spirit Airlines - these airlines can fly you to your destination from $300 and $301, respectively. Alaska 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 $149 on Southwest. Other airlines that offer cheap prices include Sun Country Air from $150 and Spirit Airlines from $152 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 Air Tahiti Nui (95%), American Airlines (88%) or Alaska Airlines (77%) 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 $148. While the most popular route (Seattle/Tacoma Intl - Philadelphia) can be booked for $157 on average our data indicates $715 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 $56.

  • 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
Reading
Wildwood
Exton
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Cherry Hill
Essington
Chester
Willow Grove
Newark
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West Chester
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Alternative routes for Seattle to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
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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 marzo 8, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$85Average$204FlexibilityNo cancel feeOn-time65%
FrontierCheapest$128Average$252FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$220Average$334FlexibilityNo cancel feeOn-time83%
DeltaCheapest$240Average$397FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$271Average$473FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$285Average$507FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$304Average$469FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$336Average$631FlexibilityNo cancel feeOn-time63%
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