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Cheap flights from Seattle to Philadelphia from C$ 214

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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
13 Mar — 20 Mar1
1 adult

The best prices from Seattle/Tacoma Intl to Philadelphia are usually found in March or January, booked 85 days in advance, depart on a Thursday or Monday and return on a Monday

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 8 March 2025.

Round-trip from

C$ 426

One-way from

C$ 214

Popular in

December

Cheapest in

March

Average price

C$ 555
Alaska Airlines
  • Alaska Airlines
  • 22/4-29/4
  • Nonstop
  • 11h 22m total
  • Seattle to Philadelphia
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Southwest
  • Southwest
  • 9/4
  • 1 total stop
  • 6h 55m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (C$ 35 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 8 March 2025.

Tue 22/49:29 p.m.SEA - PHL
Nonstop5h 15mAlaska Airlines
Tue 29/46:53 p.m.PHL - SEA
Nonstop6h 07mAlaska Airlines
Deal found 7/3C$ 426
Tue 15/46:00 a.m.SEA - PHL
1 stop8h 45mSouthwest
Wed 23/42:40 p.m.PHL - SEA
2 stops11h 50mSouthwest
Deal found 6/3C$ 433
Sat 26/46:05 a.m.SEA - PHL
1 stop8h 19mDelta
Tue 29/411:31 a.m.PHL - SEA
1 stop7h 36mDelta
Deal found 7/3C$ 440
Sat 26/47:00 a.m.SEA - PHL
1 stop7h 25mUnited Airlines
Sat 3/51:00 p.m.PHL - SEA
2 stops11h 02mUnited Airlines
Deal found 6/3C$ 456
Thu 21/811:59 p.m.SEA - PHL
1 stop8h 16mSun Country Air
Sun 24/812:10 p.m.PHL - SEA
1 stop13h 36mSun Country Air
Deal found 6/3C$ 487
Thu 18/99:45 p.m.SEA - PHL
Nonstop5h 16mHawaiian Airlines
Mon 22/96:35 p.m.PHL - SEA
Nonstop6h 12mHawaiian Airlines
Deal found 7/3C$ 526
Sun 4/51:14 a.m.SEA - PHL
1 stop9h 57mAmerican Airlines
Thu 8/52:55 p.m.PHL - SEA
1 stop11h 00mAmerican Airlines
Deal found 7/3C$ 678

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 8 March 2025.

Fly from

Seattle

Fly to

Philadelphia

Route

Depart

Return

Price

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 22/4

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

Nonstop5h 15m

Philadelphia

Tue 29/4

6:53 p.m.-10:00 p.m.

Nonstop6h 07m

C$ 426

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 15/4

6:00 a.m.-5:45 p.m.

1 stop8h 45m

Philadelphia

Wed 23/4

2:40 p.m.-11:30 p.m.

2 stops11h 50m

C$ 433

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 26/4

6:05 a.m.-5:24 p.m.

1 stop8h 19m

Philadelphia

Mon 28/4

6:34 p.m.-12:02 a.m.

1 stop8h 28m

C$ 440

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 26/4

7:00 a.m.-5:25 p.m.

1 stop7h 25m

Philadelphia

Sat 3/5

1:00 p.m.-9:02 p.m.

2 stops11h 02m

C$ 456

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 21/8

11:59 p.m.-11:15 a.m.

1 stop8h 16m

Philadelphia

Sun 24/8

12:10 p.m.-10:46 p.m.

1 stop13h 36m

C$ 487

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sun 4/5

1:14 a.m.-2:11 p.m.

1 stop9h 57m

Philadelphia

Thu 8/5

2:55 p.m.-10:55 p.m.

1 stop11h 00m

C$ 678

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 2/4

9:54 p.m.-6:00 a.m.

Nonstop5h 06m

Philadelphia

Sat 12/4

5:46 p.m.-8:56 p.m.

Nonstop6h 10m

C$ 712

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 28/6

12:30 a.m.-10:47 a.m.

1 stop7h 17m

Philadelphia

Mon 7/7

6:52 p.m.-9:57 p.m.

Nonstop6h 05m

C$ 1,058

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 9/4

6:00 a.m.-3:55 p.m.

1 stop6h 55m

C$ 214

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 4/4

11:59 p.m.-9:04 p.m.

1 stop18h 05m

C$ 226

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 14 results
1
2

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 28 February 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, 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 8 March 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 58% 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 8 March 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
4,314 reviews
Check prices

Crew

8.7

Boarding

8.2

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

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
Check prices

Crew

8.7

Boarding

8.2

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

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
Check prices

Crew

8.7

Boarding

8.2

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

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
Check prices

Crew

8.7

Boarding

8.2

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

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
Check prices

Crew

8.7

Boarding

8.2

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

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
Check prices

Crew

8.7

Boarding

8.2

Food

7.1

Entertainment

7.6

Comfort

8.1

Overall

8.1

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?

    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 06m 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 7 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 Alaska Airlines. Our recent data shows that you can find tickets from as low as C$ 426 on this airline. Additional options worth looking into are Southwest and Delta, starting at C$ 433 and C$ 440 round-trip. 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 C$ 214 on Southwest. Other airlines that offer cheap prices include Sun Country Air from C$ 226 and Delta from C$ 228 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: Air Tahiti Nui (95%), American Airlines (88%), Alaska Airlines( 77%).

  • 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
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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 8 March 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapestC$ 333AverageC$ 541FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Alaska AirlinesCheapestC$ 410AverageC$ 596FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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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