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.
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 |
Find flight deals from Seattle to Philadelphia
Cheapest flights from Seattle to PhiladelphiaExplore 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.
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.
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
Fly to
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
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
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
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
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
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Tue 12/8
5:35 a.m.-4:00 p.m.
1 stop7h 25m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 13/8
5:30 a.m.-5:45 p.m.
1 stop9h 15m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Thu 24/7
7:00 p.m.-5:37 a.m.
1 stop7h 37m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Wed 23/7
6:15 p.m.-10:08 a.m.
1 stop12h 53m
SeattlePhiladelphia
SEA - PHL
SEAPHL
Seattle/Tacoma Intl
Fri 15/8
10:50 p.m.-7:00 a.m.
Nonstop5h 10m
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.
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.
Crew
Overall
Food
Boarding
Entertainment
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Crew
Overall
Food
Boarding
Entertainment
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Crew
Overall
Food
Boarding
Entertainment
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Crew
Overall
Food
Boarding
Entertainment
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Crew
Overall
Food
Boarding
Entertainment
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
Crew
Overall
Food
Boarding
Entertainment
Comfort
Reviews
Anonymous,Aug 2024
SEA - LAS
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.
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Alternative routes for Seattle to Philadelphia
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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.