Price observed over the last 3 months for a round trip.
Compare all flight tickets and find cheap flights from Seattle to Philadelphia
The cheapest flights right now
Seattle – Philadelphia
Outbound – Nov 19, 2026
direct
5h 13m Return – Nov 25, 2026
direct
6h 7m $408
2 days ago
Seattle – Philadelphia
Outbound – Nov 20, 2026
direct
5h 4m Return – Nov 26, 2026
direct
6h 10m $407
2 days ago
Seattle – Philadelphia
Outbound – Nov 19, 2026
direct
5h 3m Return – Nov 26, 2026
direct
6h 31m $396
2 days ago
* Prices are in USD per passenger, including taxes, for a round trip. Prices are based on searches carried out within the last 72 hours. Please note that availability and ticket prices are subject to change and should not be considered as the final price quoted.
Cheapest flight tickets
$316
Average price of a round trip
$378
Average flight ticket price recorded over the last 3 months for a round trip.
Flight duration
5h14
A flight from Seattle to Philadelphia takes on average 5h14.
Best time
September
According to user searches, the ideal month to go to Philadelphia is September.
Tips for finding a cheap flight from Seattle to Philadelphia
Check out our tips for booking your flight to Philadelphia (USA) from Seattle (USA) at the cheapest possible price.
Usually, the cheapest month to pick up a ticket on this route is April, with an average flight ticket price of $151 (calculation over the last two years). The most touristic season corresponds to the months of February, October and April.
For the cheapest flights, it is advisable to buy your ticket at least 30 days before the departure date.
The airline offering the cheapest flight tickets is Frontier Airlines. A ticket from the airline Frontier Airlines to Philadelphia costs on average $356.
The airlines that offer the most flights are American Airlines, Alaska Airlines and Asiana Airlines.
Price of flight tickets from Seattle to Philadelphia
Here is some information and tips to know before booking your flight:
- Flight ticket prices range from $316 to $491
- The average price of a flight ticket is about $378
- Prices are lowest for stays in the month of April
- The month in which booking a ticket is cheaper is: October
info departure city :
Seattle, USA
airports :
Kenmore Air Harbor Spb. (LKE)
Seattle-Tacoma International Airport (SEA)
Renton Municipal Airport (RNT)
King County International Airport (BFI)
local time :
Seattle is a city in the country USA, the time zone is [[timezone]]. In Seattle, it is currently {fromLocalTime}, the temperature is on average 12°C, with a minimum of 9°C and a maximum of 17°C.
The city of Seattle (SEA) has 4 airport(s): Kenmore Air Harbor Spb., Seattle-Tacoma, Renton and King County
destination info :
Philadelphia, USA
airports :
Philadelphia International Airport (PHL)
Northeast Philadelphia Airport (PNE)
local time :
Philadelphia is in the country USA, the time zone is [[timezone]]. In Philadelphia, it is currently {toLocalTime}, the temperature is on average 13°C, with a minimum of 8°C and a maximum of 18°C.
The city of Philadelphia (PHL) has 2 airport(s): Philadelphia International and Northeast Philadelphia
Useful info about Philadelphia
What is the least touristic period to go to Philadelphia?
If you want to visit Philadelphia during the least touristic period, choose the month of September.
What is the most popular time to travel to Philadelphia?
In Philadelphia, the most popular month is February. It is during this period that the prices offered by airlines are also the highest.
When should I book my flight from Seattle to Philadelphia?
According to our data, it is recommended to book your flight 30 days before your departure. If you book your flight ticket 5 weeks before your departure, you may find a price below average. The cheapest day to book a flight from Seattle to Philadelphia is Tuesday.
What are the arrival and destination airports when traveling between Seattle and Philadelphia?
When you leave, you can leave from Seattle-Tacoma, and you will arrive at Philadelphia International or Trenton-Mercer.
How to reach Seattle airport from the city centre?
The airport Kenmore Air Harbor Spb. is located 3 km, Seattle-Tacoma is located 16 km, Renton is located 16 km or King County is located 8 km from the city centre. You can access it by using public transportation, taking a taxi, or renting a car.
Are there other means of transportation to go from Seattle to Philadelphia?
Airplane is the only means of transportation listed on Liligo for this journey.
Are there big differences in weather between Seattle and Philadelphia?
In summer, the average temperature is 24°C in Philadelphia and 18°C in Seattle. The average rainfall in summer is 129 mm in Philadelphia and 38 mm in Seattle. In summer, it is warmer in Philadelphia and it rains less in Seattle. In winter, it is colder in Seattle and it rains more in Seattle.
