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 14 days ago

July 2026

Mon

Tue

Wed

Thu

Fri

Sat

Sun

29 30 1 2 3 4 5$531 6$521 7$447 8$484 9$484 10$484 11$447 12$531 13$469 14$447 15$432 16$479 17$503 18$712 19$597 20$479 21$457 22$457 23$514 24$504 25$617 26$537 27$413 28$412 29$388 30$423 31$388 1$463 2$423

Great Availability

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

Monday, July 20th, 2026

5 round-trip options

Returning

Mon, Jul 27, 2026•7 Day Trip

$479 USD

Returning

Thu, Jul 30, 2026•10 Day Trip

$624 USD

Returning

Fri, Jul 31, 2026•11 Day Trip

$564 USD

Returning

Sat, Aug 1, 2026•12 Day Trip

$634 USD

Returning

Mon, Aug 3, 2026•14 Day Trip

$514 USD