Seattle / Tacoma (SEA) to Chicago (ORD) flight deal from $177 USD in economy class

UAUnited Airlines

Round Trip•Economy

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

ORD

O'Hare International Airport

Chicago, United States

$305 USD

-42%$177 USD

Verified Nov 1, 2025 at 7:04 AM

December 2025

Today

Mon

Tue

Wed

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Sun

1$399 2$217 3$217 4$227 5$227 6$217 7$227 8$227 9$217 10$217 11$227 12$227 13$217 14$227 15$227 16$217 17$227 18$336 19$287 20$430 21$346 22$336 23$315 24$203 25$177 26$267 27$213 28$267 29$267 30$197 31$177 1 2 3 4

Fair Availability

20% of dates checked are available within 10% of the lowest price

Thursday, December 18th, 2025

10 round-trip options

Returning

Tue, Dec 23, 2025•5 Day Trip

$456 USD

Google Flights

Returning

Wed, Dec 24, 2025•6 Day Trip

$336 USD

Google Flights

Returning

Thu, Dec 25, 2025•7 Day Trip

$373 USD

Google Flights

Returning

Fri, Dec 26, 2025•8 Day Trip

$471 USD

Google Flights

Returning

Sat, Dec 27, 2025•9 Day Trip

$514 USD

Google Flights

Returning

Sun, Dec 28, 2025•10 Day Trip

$757 USD

Google Flights

Returning

Mon, Dec 29, 2025•11 Day Trip

$410 USD

Google Flights

Returning

Tue, Dec 30, 2025•12 Day Trip

$511 USD

Google Flights

Returning

Wed, Dec 31, 2025•13 Day Trip

$336 USD

Google Flights

Returning

Thu, Jan 1, 2026•14 Day Trip

$424 USD

Google Flights