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, July 16th, 2026

7 round-trip options

Returning
Tue, Jul 21, 2026•5 Day Trip
$484 USD
Google Flights
Returning
Thu, Jul 23, 2026•7 Day Trip
$531 USD
Google Flights
Returning
Sat, Jul 25, 2026•9 Day Trip
$634 USD
Google Flights
Returning
Mon, Jul 27, 2026•11 Day Trip
$504 USD
Google Flights
Returning
Tue, Jul 28, 2026•12 Day Trip
$469 USD
Google Flights
Returning
Wed, Jul 29, 2026•13 Day Trip
$479 USD
Google Flights
Returning
Thu, Jul 30, 2026•14 Day Trip
$514 USD
Google Flights