Seattle / Tacoma (SEA) to St. Louis (STL) flight deal from $158 USD in economy class

AAAmerican Airlines

Round Trip•Economy

SEA

Seattle–Tacoma International Airport

Seattle / Tacoma, United States

STL

Lambert-Saint Louis International Airport

St. Louis, United States

$361 USD

-56%$158 USD

Verified Oct 31, 2025 at 12:51 AM

December 2025

Today

Mon

Tue

Wed

Thu

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Sat

Sun

1$308 2$184 3$158 4$167 5$167 6$158 7$167 8$167 9$158 10$158 11$167 12$243 13$234 14$243 15$283 16$234 17$283 18$435 19$459 20$500 21$435 22$445 23$421 24$333 25$216 26$252 27$243 28$243 29$234 30$234 31$207 1 2 3 4

Rare Availability

9% of dates checked are available within 10% of the lowest price

Thursday, December 25th, 2025

10 round-trip options

Returning

Tue, Dec 30, 2025•5 Day Trip

$380 USD

Google Flights

Returning

Wed, Dec 31, 2025•6 Day Trip

$380 USD

Google Flights

Returning

Thu, Jan 1, 2026•7 Day Trip

$335 USD

Google Flights

Returning

Fri, Jan 2, 2026•8 Day Trip

$421 USD

Google Flights

Returning

Sat, Jan 3, 2026•9 Day Trip

$477 USD

Google Flights

Returning

Sun, Jan 4, 2026•10 Day Trip

$357 USD

Google Flights

Returning

Mon, Jan 5, 2026•11 Day Trip

$280 USD

Google Flights

Returning

Tue, Jan 6, 2026•12 Day Trip

$256 USD

Google Flights

Returning

Wed, Jan 7, 2026•13 Day Trip

$233 USD

Google Flights

Returning

Thu, Jan 8, 2026•14 Day Trip

$216 USD

Google Flights