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

Delta Air LinesDLDelta Air Lines
Round Trip•Economy
United StatesPHL

Philadelphia International Airport

Philadelphia, United States
United StatesSEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States
$399 USD
-18%$329 USD
Verified 13 days ago
Great Availability
69% of dates checked are available within 10% of the lowest price

Thursday, October 1st, 2026

5 round-trip options

Returning
Thu, Oct 8, 2026•7 Day Trip
$329 USD
Google Flights
Returning
Fri, Oct 9, 2026•8 Day Trip
$329 USD
Google Flights
Returning
Sat, Oct 10, 2026•9 Day Trip
$329 USD
Google Flights
Returning
Mon, Oct 12, 2026•11 Day Trip
$329 USD
Google Flights
Returning
Wed, Oct 14, 2026•13 Day Trip
$329 USD
Google Flights