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 14 days ago
Great Availability
68% of dates checked are available within 10% of the lowest price

Friday, August 21st, 2026

5 round-trip options

Returning
Fri, Aug 28, 2026•7 Day Trip
$339 USD
Google Flights
Returning
Mon, Aug 31, 2026•10 Day Trip
$339 USD
Google Flights
Returning
Tue, Sep 1, 2026•11 Day Trip
$339 USD
Google Flights
Returning
Wed, Sep 2, 2026•12 Day Trip
$339 USD
Google Flights
Returning
Fri, Sep 4, 2026•14 Day Trip
$349 USD
Google Flights