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

Tuesday, August 11th, 2026

5 round-trip options

Returning
Tue, Aug 18, 2026•7 Day Trip
$373 USD
Google Flights
Returning
Fri, Aug 21, 2026•10 Day Trip
$383 USD
Google Flights
Returning
Sat, Aug 22, 2026•11 Day Trip
$507 USD
Google Flights
Returning
Sun, Aug 23, 2026•12 Day Trip
$383 USD
Google Flights
Returning
Tue, Aug 25, 2026•14 Day Trip
$373 USD
Google Flights