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

Thursday, December 17th, 2026

7 round-trip options

Returning
Tue, Dec 22, 2026•5 Day Trip
$648 USD
Google Flights
Returning
Wed, Dec 23, 2026•6 Day Trip
$533 USD
Google Flights
Returning
Fri, Dec 25, 2026•8 Day Trip
$349 USD
Google Flights
Returning
Sun, Dec 27, 2026•10 Day Trip
$913 USD
Google Flights
Returning
Tue, Dec 29, 2026•12 Day Trip
$758 USD
Google Flights
Returning
Wed, Dec 30, 2026•13 Day Trip
$648 USD
Google Flights
Returning
Thu, Dec 31, 2026•14 Day Trip
$533 USD
Google Flights