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

Monday, December 21st, 2026

7 round-trip options

Returning
Sat, Dec 26, 2026•5 Day Trip
$792 USD
Google Flights
Returning
Sun, Dec 27, 2026•6 Day Trip
$947 USD
Google Flights
Returning
Tue, Dec 29, 2026•8 Day Trip
$792 USD
Google Flights
Returning
Thu, Dec 31, 2026•10 Day Trip
$567 USD
Google Flights
Returning
Sat, Jan 2, 2027•12 Day Trip
$682 USD
Google Flights
Returning
Sun, Jan 3, 2027•13 Day Trip
$567 USD
Google Flights
Returning
Mon, Jan 4, 2027•14 Day Trip
$383 USD
Google Flights