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, August 6th, 2026

7 round-trip options

Returning
Tue, Aug 11, 2026•5 Day Trip
$567 USD
Google Flights
Returning
Thu, Aug 13, 2026•7 Day Trip
$533 USD
Google Flights
Returning
Sat, Aug 15, 2026•9 Day Trip
$827 USD
Google Flights
Returning
Mon, Aug 17, 2026•11 Day Trip
$657 USD
Google Flights
Returning
Tue, Aug 18, 2026•12 Day Trip
$657 USD
Google Flights
Returning
Wed, Aug 19, 2026•13 Day Trip
$607 USD
Google Flights
Returning
Thu, Aug 20, 2026•14 Day Trip
$607 USD
Google Flights