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Cheap flights from Seattle to Philadelphia from C$ 204

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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
17 Jun — 24 Jun1
1 adult

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 12 June 2025.

Round-trip from

C$ 421

One-way from

C$ 204

Popular in

December

Cheapest in

March

Average price

C$ 638

Good round-trip deal

C$ 953 or less
United Airlines
  • United Airlines
  • 15/7-17/7
  • 2 total stops
  • 15h 34m total
  • Seattle to Philadelphia
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United Airlines
  • United Airlines
  • 7/8
  • 1 total stop
  • 7h 27m total
  • Seattle to Philadelphia
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 52 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 23 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip 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 12 June 2025.

Tue 15/77:00 p.m.SEA - PHL
1 stop7h 37mUnited Airlines
Thu 17/77:59 p.m.PHL - SEA
1 stop7h 57mUnited Airlines
Deal found 12/6C$ 421
Wed 6/85:45 p.m.SEA - PHL
1 stop9h 05mDelta
Sun 17/86:59 p.m.PHL - SEA
1 stop7h 48mDelta
Deal found 11/6C$ 428
Wed 26/119:45 p.m.SEA - PHL
Nonstop5h 16mAlaska Airlines
Thu 4/127:25 a.m.PHL - SEA
Nonstop6h 12mAlaska Airlines
Deal found 11/6C$ 433
Tue 5/811:10 p.m.SEA - PHL
1 stop7h 45mSouthwest
Sat 16/82:20 p.m.PHL - SEA
2 stops11h 10mSouthwest
Deal found 11/6C$ 454
Fri 4/73:11 p.m.SEA - PHL
1 stop11h 38mFrontier
Thu 10/71:02 p.m.PHL - SEA
1 stop14h 32mFrontier
Deal found 12/6C$ 473
Mon 30/63:58 p.m.SEA - PHL
1 stop10h 46mSpirit Airlines
Mon 7/710:42 a.m.PHL - SEA
1 stop31h 21mSpirit Airlines
Deal found 10/6C$ 495
Wed 9/79:15 p.m.SEA - PHL
Nonstop5h 10mHawaiian Airlines
Wed 16/76:52 p.m.PHL - SEA
Nonstop6h 05mHawaiian Airlines
Deal found 11/6C$ 522
Fri 4/710:41 p.m.SEA - PHL
Nonstop5h 07mAmerican Airlines
Thu 10/76:35 p.m.PHL - SEA
Nonstop6h 08mAmerican Airlines
Deal found 12/6C$ 544
Sat 5/712:00 p.m.SEA - PHL
1 stop14h 44mMultiple Airlines
Thu 10/76:45 a.m.PHL - SEA
Nonstop5h 57mMultiple Airlines
Deal found 12/6C$ 577
Sat 26/711:59 p.m.SEA - PHL
1 stop8h 11mSun Country Air
Thu 31/710:58 a.m.PHL - SEA
1 stop14h 49mSun Country Air
Deal found 11/6C$ 595

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 629,999 searches. Data last updated 12 June 2025.
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 15/7

7:00 p.m.-5:37 a.m.

1 stop7h 37m

Philadelphia

Thu 17/7

7:59 p.m.-12:56 a.m.

1 stop7h 57m

C$ 421

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 6/8

5:45 p.m.-5:50 a.m.

1 stop9h 05m

Philadelphia

Sat 9/8

5:00 p.m.-11:06 p.m.

1 stop9h 06m

C$ 428

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 26/11

9:45 p.m.-6:01 a.m.

Nonstop5h 16m

Philadelphia

Thu 4/12

7:25 a.m.-10:37 a.m.

Nonstop6h 12m

C$ 433

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 5/8

11:10 p.m.-9:55 a.m.

1 stop7h 45m

Philadelphia

Sat 16/8

2:20 p.m.-10:30 p.m.

2 stops11h 10m

C$ 454

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 4/7

3:11 p.m.-5:49 a.m.

1 stop11h 38m

Philadelphia

Thu 10/7

1:02 p.m.-12:34 a.m.

1 stop14h 32m

C$ 473

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Mon 30/6

3:58 p.m.-5:44 a.m.

1 stop10h 46m

Philadelphia

Mon 7/7

10:42 a.m.-3:03 p.m.

1 stop31h 21m

C$ 495

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 9/7

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

Nonstop5h 10m

Philadelphia

Mon 14/7

6:45 a.m.-9:42 a.m.

Nonstop5h 57m

C$ 522

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 4/7

10:41 p.m.-6:48 a.m.

Nonstop5h 07m

Philadelphia

Thu 10/7

6:35 p.m.-9:43 p.m.

Nonstop6h 08m

C$ 544

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 5/7

12:00 p.m.-5:44 a.m.

1 stop14h 44m

Philadelphia

Thu 10/7

6:45 a.m.-9:42 a.m.

Nonstop5h 57m

C$ 577

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Sat 26/7

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

1 stop8h 11m

Philadelphia

Thu 31/7

10:58 a.m.-10:47 p.m.

1 stop14h 49m

C$ 595

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 18 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.

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 9 June 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$ 419). 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 12 June 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 71% on airfare.

Weekly flight availability from Seattle to Philadelphia

Explore weekly flight availability from Seattle to Philadelphia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 12 June 2025.

The most flights from SEA to PHL are scheduled on a Wednesday (10 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (1 on average).

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 12 June 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest 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.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

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.

  • How popular is this Seattle to Philadelphia flight route?

    This flight path from Seattle/Tacoma Intl to Philadelphia was viewed by 6 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 United Airlines. Our recent data shows that you can find tickets from as low as C$ 421 on this airline. Additional options worth looking into are Delta and Alaska Airlines, starting at C$ 428 and C$ 433 round-trip. United Airlines is currently priced 31% 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$ 204 on United Airlines. Other airlines that offer cheap prices include Delta from C$ 215 and Sun Country Air from C$ 243 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: American Airlines (75%), Alaska Airlines (70%), Hawaiian Airlines( 70%).

  • What are the cheapest flights from Seattle to Philadelphia?

    Looking for the cheapest flight from Seattle to Philadelphia? While on average our users pay C$ 1,063, our data indicates the cheapest price to be C$ 546. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 656.

  • 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$ 419). 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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