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Cheap flights from Seattle to Philadelphia from C$ 202

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 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PHL
7 Jul — 14 Jul1
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 2 July 2025.

Round-trip from

C$ 425

One-way from

C$ 202

Popular in

December

Cheapest in

March

Average price

C$ 628

Good round-trip deal

C$ 312 or less
Southwest
  • Southwest
  • 3/9-10/9
  • 3 total stops
  • 19h 05m total
  • Seattle to Philadelphia
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Southwest
  • Southwest
  • 12/8
  • 1 total stop
  • 7h 45m 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$ 24 potential savings vs. average RT price).
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Average for round-trip flights in July 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 2 July 2025.

Wed 3/910:10 a.m.SEA - PHL
1 stop8h 40mSouthwest
Wed 10/97:45 a.m.PHL - SEA
2 stops10h 25mSouthwest
Deal found 2/7C$ 425
Wed 6/85:45 p.m.SEA - PHL
1 stop9h 05mDelta
Mon 11/86:59 p.m.PHL - SEA
1 stop7h 48mDelta
Deal found 1/7C$ 427
Tue 12/812:20 a.m.SEA - PHL
1 stop7h 27mUnited Airlines
Tue 19/83:00 p.m.PHL - SEA
1 stop8h 42mUnited Airlines
Deal found 1/7C$ 442
Fri 22/89:45 p.m.SEA - PHL
Nonstop5h 15mAlaska Airlines
Mon 1/97:22 a.m.PHL - SEA
Nonstop5h 56mAlaska Airlines
Deal found 2/7C$ 446
Thu 20/116:24 p.m.SEA - PHL
1 stop12h 27mSun Country Air
Sun 23/1110:00 a.m.PHL - SEA
1 stop10h 15mSun Country Air
Deal found 2/7C$ 484

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 2 July 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

Wed 3/9

10:10 a.m.-9:50 p.m.

1 stop8h 40m

Philadelphia

Wed 10/9

7:45 a.m.-3:10 p.m.

2 stops10h 25m

C$ 425

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 6/8

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

1 stop9h 05m

Philadelphia

Sun 10/8

5:30 a.m.-12:09 p.m.

1 stop9h 39m

C$ 427

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 12/8

12:20 a.m.-10:47 a.m.

1 stop7h 27m

Philadelphia

Tue 19/8

3:00 p.m.-8:42 p.m.

1 stop8h 42m

C$ 442

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 22/8

9:45 p.m.-6:00 a.m.

Nonstop5h 15m

Philadelphia

Wed 27/8

6:58 p.m.-10:00 p.m.

Nonstop6h 02m

C$ 446

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 20/11

6:24 p.m.-9:51 a.m.

1 stop12h 27m

Philadelphia

Sun 23/11

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

1 stop10h 15m

C$ 484

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Tue 12/8

5:35 a.m.-4:00 p.m.

1 stop7h 25m

C$ 202

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 13/8

5:30 a.m.-5:45 p.m.

1 stop9h 15m

C$ 203

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Thu 24/7

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

1 stop7h 37m

C$ 207

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Wed 23/7

6:15 p.m.-10:08 a.m.

1 stop12h 53m

C$ 249

SeattlePhiladelphia

SEA - PHL

SEAPHL

Seattle/Tacoma Intl

Fri 15/8

10:50 p.m.-7:00 a.m.

Nonstop5h 10m

C$ 334

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/7

Showing 1-10 of 12 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.

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 27 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 2 July 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 63% 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 2 July 2025.

The most flights from SEA to PHL are scheduled on a Wednesday (12 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (2 on average).

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 2 July 2025.
Get a feel of what it's like to fly with Alaska Airlines,Southwest, andDelta from Seattle to Philadelphia by reading reviews from past customers. 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

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Entertainment

7.1

Comfort

7.8

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

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Entertainment

7.1

Comfort

7.8

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
4,272 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Entertainment

7.1

Comfort

7.8

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
7,983 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Entertainment

7.1

Comfort

7.8

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
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
JetBlue
7.3
Good
2,918 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Entertainment

7.1

Comfort

7.8

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 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 Southwest. Our recent data shows that you can find tickets from as low as C$ 425 on this airline. Additional options worth looking into are Delta and United Airlines, starting at C$ 427 and C$ 442 round-trip. Southwest is currently priced 30% 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$ 202 on Southwest. Other airlines that offer cheap prices include Delta from C$ 203 and United Airlines from C$ 207 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%), Hawaiian Airlines (63%), Air Tahiti Nui( 63%).

  • 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$ 633, our data indicates the cheapest price to be C$ 312. The most popular route (Seattle/Tacoma Intl - Philadelphia), is priced around C$ 348.

  • 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

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