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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 2/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
Jan 8 — Jan 152
Wed 1/8
Wed 1/15
2 travelers, Economy
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The best prices from Seattle/Tacoma Intl to Philadelphia are usually found in February or March, booked 38 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 January 3, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$310
(Delta)

One-way from

$149
(Alaska Airlines)

Popular in

December

Cheapest in

February

Average price

$376
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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High demand for flights, 7% potential price rise
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Best time to find cheap flights, 3% potential price drop
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Average for round-trip flights in January 2025
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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 January 3, 2025.

This CheapOair deal was found by Cheapflights users on 1/2. 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.
Fri 1/245:45 amSEA - PHL
2 stops22h 33mSpirit Airlines
Mon 1/2710:05 pmPHL - SEA
2 stops29h 14mSpirit Airlines
Deal found 1/2$312
This Delta deal was found by Cheapflights users on 1/1. 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 1/156:15 amSEA - PHL
1 stop7h 47mDelta
Tue 1/214:50 pmPHL - SEA
1 stop8h 35mDelta
Deal found 1/1$314
This Alaska Airlines deal was found by Cheapflights users on 1/2. 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.
Sun 2/29:15 amSEA - PHL
Nonstop5h 17mAlaska Airlines
Wed 2/56:32 pmPHL - SEA
Nonstop6h 23mAlaska Airlines
Deal found 1/2$317
This United Airlines deal was found by Cheapflights users on 1/1. 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.
Wed 1/155:45 amSEA - PHL
1 stop8h 35mUnited Airlines
Tue 1/2112:15 pmPHL - SEA
2 stops11h 56mUnited Airlines
Deal found 1/1$319
This American Airlines deal was found by Cheapflights users on 1/1. 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 5/311:06 pmSEA - PHL
Nonstop5h 07mAmerican Airlines
Wed 5/76:30 pmPHL - SEA
Nonstop6h 05mAmerican Airlines
Deal found 1/1$322
This Travelocity deal was found by Cheapflights users on 1/1. 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 2/59:15 amSEA - PHL
Nonstop5h 17mMultiple Airlines
Sun 2/98:33 amPHL - SEA
1 stop11h 27mMultiple Airlines
Deal found 1/1$325
This Frontier deal was found by Cheapflights users on 1/2. 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.
Thu 3/132:02 pmSEA - PHL
1 stop12h 03mFrontier
Sun 3/166:40 amPHL - SEA
1 stop8h 22mFrontier
Deal found 1/2$335
This Kiwi.com deal was found by Cheapflights users on 1/1. 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.
Sat 7/1211:59 pmSEA - PHL
1 stop8h 11mSun Country Air
Fri 7/1812:05 pmPHL - SEA
1 stop13h 45mSun Country Air
Deal found 1/1$350
This Southwest deal was found by Cheapflights users on 1/1. 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.
Sun 2/26:50 amSEA - PHL
2 stops12h 05mSouthwest
Tue 2/116:00 amPHL - SEA
1 stop8h 50mSouthwest
Deal found 1/1$362

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 January 3, 2025.

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Fly to

Any airport

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/5

7:25 am-11:52 pm

2 stops13h 27m

Philadelphia

Wed 2/12

6:00 am-10:45 am

1 stop7h 45m

$310

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 2/16

5:38 pm-5:53 am

1 stop9h 15m

Philadelphia

Thu 2/20

5:41 pm-12:25 am

1 stop9h 44m

$312

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 2/24

7:43 pm-2:49 pm

1 stop16h 06m

Philadelphia

Wed 2/26

6:25 pm-9:51 pm

Nonstop6h 26m

$315

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/5

9:15 am-5:32 pm

Nonstop5h 17m

Philadelphia

Sun 2/9

6:32 pm-9:55 pm

Nonstop6h 23m

$317

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 1/15

5:45 am-5:20 pm

1 stop8h 35m

Philadelphia

Tue 1/21

12:15 pm-9:11 pm

2 stops11h 56m

$319

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 5/3

11:06 pm-7:13 am

Nonstop5h 07m

Philadelphia

Wed 5/7

6:30 pm-9:35 pm

Nonstop6h 05m

$322

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 6/12

11:59 pm-11:10 am

1 stop8h 11m

Philadelphia

Mon 6/16

12:05 pm-5:32 pm

1 stop8h 27m

$363

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 3/21

5:00 am-7:00 pm

2 stops11h 00m

Philadelphia

Mon 3/24

4:40 pm-12:50 am

1 stop11h 10m

$422

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/5

9:15 am-5:32 pm

Nonstop5h 17m

$149

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 2/4

11:59 pm-10:50 am

1 stop7h 51m

$150

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/2

Showing 1-10 of 16 results
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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 January.
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*1 star
AranGrantPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy2 starsTrust Score*2 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy2 starsTrust Score*2 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.

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 December 27, 2024.

The best time to book flights from Seattle to Philadelphia is 38 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 January 3, 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Philadelphia in the afternoon. If you’re flexible enough to do this you can expect to save up to 46% on your trip compared to booking a flight in the morning.

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 December 16, 2024.

Travelers seeking maximum savings on their Seattle to Philadelphia flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Sunday mornings 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 January 3, 2025.
Read reviews from past customers who have flown Delta, Spirit Airlines and Alaska Airlines 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
4,694 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,694 reviews
Southwest
8.1
Very good
4,694 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,603 reviews
Southwest
8.1
Very good
4,694 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,536 reviews
Southwest
8.1
Very good
4,694 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,969 reviews
Southwest
8.1
Very good
4,694 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,694 reviews

Comfort

8.1

Entertainment

7.7

Boarding

8.2

Crew

8.7

Overall

8.1

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 4h 55m 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 $310, Delta will fly you from Seattle to Philadelphia and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Spirit Airlines and Alaska Airlines - these airlines can fly you to your destination from $312 and $317, respectively. Delta is currently priced 29% 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 Alaska Airlines. Other airlines that offer cheap prices include United Airlines from $150 and Sun Country Air from $153 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 (100%), British Airways (100%) or Air Tahiti Nui (85%) 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 $168. While the most popular route (Seattle/Tacoma Intl - Philadelphia) can be booked for $178 on average our data indicates $902 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 Denver most frequently.

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

    Coors Field, 16th Street Mall, and Paramount Theatre are the most popular attractions in Denver if you're in need of something to do during your layover. 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 on a layover in Denver in need of a rental car can book one at Denver Intl for about $63.

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

    Seattle to Philadelphia flights that have layovers will least frequently stop in Salt Lake City.

  • 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.

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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 January 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$85Average$214FlexibilityNo cancel feeOn-time65%
FrontierCheapest$128Average$258FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$220Average$334FlexibilityNo cancel feeOn-time83%
DeltaCheapest$232Average$405FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$256Average$480FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$276Average$492FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$297Average$469FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$336Average$651FlexibilityNo cancel feeOn-time63%
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