SEA to PHL from $329 in economy – flightdeals.net

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Delta Air Lines

DLDelta Air Lines

Round Trip•Economy

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

Philadelphia International Airport

Philadelphia, United States

$401 USD

-18%$329 USD

Verified 15 days ago

September 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

31$329 1$329 2$329 3$339 4$329 5$339 6$339 7$523 8$329 9$329 10$329 11$329 12$339 13$329 14$329 15$329 16$329 17$329 18$329 19$329 20$329 21$329 22$329 23$329 24$329 25$329 26$329 27$329 28$329 29$329 30$329 1$329 2$329 3$329 4$329

Great Availability

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

Monday, September 7th, 2026

3 round-trip options

Returning

Wed, Sep 16, 2026•9 Day Trip

$523 USD

Returning

Fri, Sep 18, 2026•11 Day Trip

$533 USD

Returning

Sun, Sep 20, 2026•13 Day Trip

$523 USD