* All fares below were last found on: Sep 23, 2018 and 7:02:21 AM.
Fares are round trip, Fares incl. all fuel surcharges, our service fees and taxes.
Displayed fares are based on historical data, are subject to change and cannot be guaranteed at the time of booking.
See all booking terms and conditions
Find the deals you want & manage your trips ... all while on the go.
Earn rewards points & other travel perks when you spend.
Get inspired, learn expert tips & add to your travel bucket list.
6 Packing Hacks for Traveling Families
Must Eat Mexico City
How Well Do You Know Your U.S. Hispanic Heritage History?
How to Take a Star-Studded Tour of Los Angeles
8 of the Best Destinations for Solo Travel
Book your flights from Seattle (SEA) to Philadelphia (PHL) on OneTravel. Take advantage of the exclusive travel deals and enjoy great savings on flights to top destinations.
One of America’s most historical cities, Philadelphia has lots to see and do! Take a trip to Philadelphia and spend time exploring the attractions, go shopping and feast on the savory local cuisine. Book flights to Philadelphia on OneTravel and save more to splurge on a vacation! We offer exclusive deals on top airlines, including AirTran, Frontier and Midwest Airlines. The average travel time to reach Philadelphia, PA from Seattle, WA is five hours.