PHL to SEA from $329 in economy

DLDelta Air Lines

Round Trip•Economy

PHL

Philadelphia International Airport

Philadelphia, United States

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

$399 USD

-18%$329 USD

Verified 13 days ago

December 2026

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

30$473 1$349 2$349 3$349 4$349 5$349 6$349 7$349 8$349 9$349 10$349 11$349 12$383 13$349 14$349 15$349 16$349 17$349 18$383 19$473 20$423 21$533 22$533 23$533 24$349 25$349 26$758 27$913 28$758 29$758 30$648 31$533 1$533 2$648 3$533

Great Availability

69% of dates checked are available within 10% of the lowest price

Friday, December 11th, 2026

7 round-trip options

Returning

Wed, Dec 16, 2026•5 Day Trip

$349 USD

Google Flights

Returning

Fri, Dec 18, 2026•7 Day Trip

$423 USD

Google Flights

Returning

Sat, Dec 19, 2026•8 Day Trip

$383 USD

Google Flights

Returning

Sun, Dec 20, 2026•9 Day Trip

$423 USD

Google Flights

Returning

Tue, Dec 22, 2026•11 Day Trip

$423 USD

Google Flights

Returning

Wed, Dec 23, 2026•12 Day Trip

$473 USD

Google Flights

Returning

Thu, Dec 24, 2026•13 Day Trip

$349 USD

Google Flights

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

Philadelphia International Airport

Seattle–Tacoma International Airport

December 2026

Friday, December 11th, 2026