Seattle / Tacoma (SEA) to Philadelphia (PHL) flight deal in economy from $329

Delta Air LinesDLDelta Air Lines
Round Trip•Economy
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
United StatesPHL

Philadelphia International Airport

Philadelphia, United States
$401 USD
-18%$329 USD
Verified 15 days ago
Great Availability
68% of dates checked are available within 10% of the lowest price

Thursday, October 8th, 2026

3 round-trip options

Returning
Sat, Oct 17, 2026•9 Day Trip
$329 USD
Google Flights
Returning
Mon, Oct 19, 2026•11 Day Trip
$329 USD
Google Flights
Returning
Wed, Oct 21, 2026•13 Day Trip
$329 USD
Google Flights