Seattle / Tacoma (SEA) to Philadelphia (PHL) cheap flight deal from $277 USD in economy class

ASAlaska Airlines, Inc.

Round Trip•Economy

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

PHL

Philadelphia International Airport

Philadelphia, United States

$422 USD

-34%$277 USD

Verified about 4 hours ago

October 2025

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

29$327 30$327 1$327 2$327 3$327 4$327 5$277 6$277 7$277 8$277 9$277 10$277 11$277 12$327 13$277 14$277 15$277 16$277 17$277 18$277 19$367 20$277 21$277 22$277 23$277 24$277 25$277 26$327 27$277 28$277 29$277 30$327 31$277 1$277 2$277

Limited Availability

16% of dates checked are available within 10% of the lowest price

Saturday, October 18th, 2025

10 round-trip options

Returning

Thu, Oct 23, 2025•5 Day Trip

$277 USD

Google Flights

Returning

Fri, Oct 24, 2025•6 Day Trip

$277 USD

Google Flights

Returning

Sat, Oct 25, 2025•7 Day Trip

$277 USD

Google Flights

Returning

Sun, Oct 26, 2025•8 Day Trip

$327 USD

Google Flights

Returning

Mon, Oct 27, 2025•9 Day Trip

$277 USD

Google Flights

Returning

Tue, Oct 28, 2025•10 Day Trip

$277 USD

Google Flights

Returning

Wed, Oct 29, 2025•11 Day Trip

$277 USD

Google Flights

Returning

Thu, Oct 30, 2025•12 Day Trip

$277 USD

Google Flights

Returning

Fri, Oct 31, 2025•13 Day Trip

$277 USD

Google Flights

Returning

Sat, Nov 1, 2025•14 Day Trip

$277 USD

Google Flights