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Cheap flights from Seattle to Philadelphia from C$ 248

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 2/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
8 Feb — 15 Feb1
1 adult

The best prices from Seattle/Tacoma Intl to Philadelphia are usually found in March or February, booked 38 days in advance, depart on a Thursday or Monday 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 3 February 2025.

Round-trip from

C$ 464

One-way from

C$ 248

Popular in

December

Cheapest in

March

Average price

C$ 552
Delta
  • Delta
  • 19/4-22/4
  • 2 total stops
  • 17h 42m total
  • Seattle to Philadelphia
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Alaska Airlines
  • Alaska Airlines
  • 2/5
  • Nonstop
  • 5h 15m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (C$ 105 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 3 February 2025.

Sat 19/46:20 a.m.SEA - PHL
1 stop8h 40mDelta
Tue 22/42:48 p.m.PHL - SEA
1 stop9h 02mDelta
Deal found 3/2C$ 464
Mon 31/37:17 p.m.SEA - PHL
2 stops11h 33mUnited Airlines
Thu 3/46:41 a.m.PHL - SEA
1 stop8h 07mUnited Airlines
Deal found 3/2C$ 472
Thu 3/411:14 p.m.SEA - PHL
Nonstop5h 01mAmerican Airlines
Sun 6/45:00 a.m.PHL - SEA
1 stop8h 15mAmerican Airlines
Deal found 3/2C$ 475
Thu 3/711:59 p.m.SEA - PHL
1 stop8h 11mSun Country Air
Thu 10/712:05 p.m.PHL - SEA
1 stop13h 45mSun Country Air
Deal found 2/2C$ 483
Wed 3/99:45 p.m.SEA - PHL
Nonstop5h 16mAlaska Airlines
Thu 11/96:35 p.m.PHL - SEA
Nonstop6h 12mAlaska Airlines
Deal found 3/2C$ 494
Thu 3/49:48 a.m.SEA - PHL
1 stop17h 17mSpirit Airlines
Sun 6/410:08 p.m.PHL - SEA
1 stop13h 35mSpirit Airlines
Deal found 3/2C$ 545
Tue 1/47:00 a.m.SEA - PHL
2 stops11h 50mSouthwest
Wed 9/42:40 p.m.PHL - SEA
2 stops11h 45mSouthwest
Deal found 3/2C$ 612

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 629,999 searches. Data last updated 3 February 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 19/4

6:20 a.m.-6:00 p.m.

1 stop8h 40m

Philadelphia

Tue 22/4

2:48 p.m.-8:50 p.m.

1 stop9h 02m

C$ 464

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 31/3

7:17 p.m.-9:50 a.m.

2 stops11h 33m

Philadelphia

Thu 3/4

6:41 a.m.-11:48 a.m.

1 stop8h 07m

C$ 472

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 3/4

11:14 p.m.-7:15 a.m.

Nonstop5h 01m

Philadelphia

Sun 6/4

5:00 a.m.-10:15 a.m.

1 stop8h 15m

C$ 475

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 3/7

11:59 p.m.-11:10 a.m.

1 stop8h 11m

Philadelphia

Thu 10/7

12:05 p.m.-10:50 p.m.

1 stop13h 45m

C$ 483

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 6/3

9:15 a.m.-5:25 p.m.

Nonstop5h 10m

Philadelphia

Mon 10/3

6:25 p.m.-9:51 p.m.

Nonstop6h 26m

C$ 508

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 3/4

9:48 a.m.-6:05 a.m.

1 stop17h 17m

Philadelphia

Sun 6/4

10:08 p.m.-8:43 a.m.

1 stop13h 35m

C$ 545

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 1/4

1:35 p.m.-11:40 p.m.

1 stop7h 05m

Philadelphia

Wed 9/4

2:40 p.m.-11:25 p.m.

2 stops11h 45m

C$ 546

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 2/5

9:29 p.m.-5:44 a.m.

Nonstop5h 15m

C$ 248

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 9/3

6:56 p.m.-5:45 a.m.

1 stop7h 49m

C$ 262

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 1/3

6:40 a.m.-9:55 p.m.

2 stops12h 15m

C$ 269

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/2

Showing 1-10 of 13 results
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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 31 January 2025.

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, January is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 388). Flying from Seattle to Philadelphia in May is currently the most expensive (average of C$ 450). 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 3 February 2025.

One of the essential ways to save on airfare from Seattle to Philadelphia is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 66% on airfare.

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 69.0 - 112.0 mm per month. July is typically the wettest month, when rainfall can reach 112.0 mm. February is typically the driest time to visit Philadelphia when rainfall is around 69.0 mm.

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 26.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 1.0 C).

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 3 February 2025.
Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta from Seattle to Philadelphia by reading reviews from past customers. 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
4,564 reviews
Check prices

Boarding

8.2

Entertainment

7.7

Food

7.1

Crew

8.7

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
4,564 reviews
Southwest
8.1
Very good
4,564 reviews
Check prices

Boarding

8.2

Entertainment

7.7

Food

7.1

Crew

8.7

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
9,681 reviews
Southwest
8.1
Very good
4,564 reviews
Check prices

Boarding

8.2

Entertainment

7.7

Food

7.1

Crew

8.7

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
8,427 reviews
Southwest
8.1
Very good
4,564 reviews
Check prices

Boarding

8.2

Entertainment

7.7

Food

7.1

Crew

8.7

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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.

JetBlue
7.4
Good
3,141 reviews
Southwest
8.1
Very good
4,564 reviews
Check prices

Boarding

8.2

Entertainment

7.7

Food

7.1

Crew

8.7

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
8,889 reviews
Southwest
8.1
Very good
4,564 reviews
Check prices

Boarding

8.2

Entertainment

7.7

Food

7.1

Crew

8.7

Comfort

8.1

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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?

    If you book a flight from Seattle to Philadelphia, you will be flying from Seattle/Tacoma Intl to Philadelphia. Flights to Philadelphia (PHL) from Seattle/Tacoma Intl (SEA) take 5h 01m for a nonstop flight. There are 2 flights from Seattle/Tacoma Intl to Philadelphia per day from 2 airlines.

  • How popular is this Seattle to Philadelphia flight route?

    This flight path from Seattle/Tacoma Intl to Philadelphia was viewed by 10 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

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

    Our cheapest airline available from Seattle to Philadelphia is Delta. Our recent data shows that you can find tickets from as low as C$ 464 on this airline. Additional options worth looking into are United Airlines and American Airlines, starting at C$ 472 and C$ 475 round-trip. 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 C$ 248 on Alaska Airlines. Other airlines that offer cheap prices include Delta from C$ 262 and Southwest from C$ 269 one-way.

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

    Before booking your flight to Philadelphia from Seattle, check out the most reliable airlines to get you to your destination on time: Qatar Airways (100%), British Airways (100%), Air Tahiti Nui( 86%).

  • 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, January is the cheapest month in which you can book a flight from Seattle to Philadelphia (average of C$ 388). Flying from Seattle to Philadelphia in May is currently the most expensive (average of C$ 450). 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

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Top 2 airlines flying from Seattle to Philadelphia

Discover the top 2 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 629,999 searches. Data last updated 3 February 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapestC$ 341AverageC$ 553FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Alaska AirlinesCheapestC$ 419AverageC$ 488FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Philadelphia?

Cheapflights helps you search for flights from Seattle to Philadelphia via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Philadelphia?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Seattle to Philadelphia for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Seattle to Philadelphia with no change fees?

Yes, we can. To see specific flights from Seattle to Philadelphia with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Philadelphia become cheaper?

Yes! Start tracking prices for Seattle to Philadelphia flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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