Cheapest one-way flights from St. Louis (STL) to Cancun (CUN), September

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
12 Sep Frontier Airlines
08 Sep Frontier Airlines
26 Sep Frontier Airlines
01 Sep Frontier Airlines
07 Sep Frontier Airlines
05 Sep Frontier Airlines
26 Sep Southwest Airlines
Direct Flight
07 Sep Southwest Airlines
Direct Flight
12 Sep Southwest Airlines
Direct Flight
05 Sep Southwest Airlines
Direct Flight
Powered by

deals for return flights from St. Louis to Cancun in September.

Book a cheap hotel in Cancun

Cheap car rent in Cancun Intl

Updated Jul 13, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

Feel free to contact us with any feedback or request another flight research.