SEA to PHL from $329 in economy

DLDelta Air Lines

Round Trip•Economy

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

PHL

Philadelphia International Airport

Philadelphia, United States

$401 USD

-18%$329 USD

Verified 16 days ago

December 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30$349 1$349 2$349 3$349 4$349 5$349 6$349 7$349 8$349 9$349 10$349 11$349 12$349 13$349 14$349 15$349 16$349 17$349 18$423 19$383 20$423 21$383 22$423 23$473 24$349 25$349 26$349 27$383 28$349 29$349 30$349 31$349 1$349 2$533 3$349

Great Availability

68% of dates checked are available within 10% of the lowest price

Wednesday, December 16th, 2026

7 round-trip options

Returning

Mon, Dec 21, 2026•5 Day Trip

$533 USD

Google Flights

Returning

Tue, Dec 22, 2026•6 Day Trip

$533 USD

Google Flights

Returning

Thu, Dec 24, 2026•8 Day Trip

$349 USD

Google Flights

Returning

Sat, Dec 26, 2026•10 Day Trip

$758 USD

Google Flights

Returning

Mon, Dec 28, 2026•12 Day Trip

$758 USD

Google Flights

Returning

Tue, Dec 29, 2026•13 Day Trip

$758 USD

Google Flights

Returning

Wed, Dec 30, 2026•14 Day Trip

$648 USD

Google Flights

Seattle / Tacoma (SEA) to Philadelphia (PHL) flight deal in economy from $329

Seattle–Tacoma International Airport

Philadelphia International Airport

December 2026

Wednesday, December 16th, 2026