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

Monday, July 6th, 2026

7 round-trip options

Returning
Sat, Jul 11, 2026•5 Day Trip
$474 USD
Google Flights
Returning
Mon, Jul 13, 2026•7 Day Trip
$511 USD
Google Flights
Returning
Wed, Jul 15, 2026•9 Day Trip
$474 USD
Google Flights
Returning
Fri, Jul 17, 2026•11 Day Trip
$545 USD
Google Flights
Returning
Sat, Jul 18, 2026•12 Day Trip
$729 USD
Google Flights
Returning
Sun, Jul 19, 2026•13 Day Trip
$614 USD
Google Flights
Returning
Mon, Jul 20, 2026•14 Day Trip
$521 USD
Google Flights