Cheapest return flights from St. Louis to Cancun in December from $245

AirHint found the following cheapest return flights from St. Louis (STL) to Cancun (CUN) in December 2025 (see full year).

Return flights

20 Dec - 25 Dec Frontier Airlines direct
19 Dec - 24 Dec Frontier Airlines direct
22 Dec - 29 Dec Frontier Airlines direct
07 Dec - 12 Dec Aeromexico
31 Dec - 10 Jan Frontier Airlines
21 Dec - 27 Dec Frontier Airlines direct
31 Dec - 10 Jan Frontier Airlines direct
20 Dec - 27 Dec Frontier Airlines direct
08 Dec - 13 Dec Frontier Airlines direct
05 Dec - 10 Dec Frontier Airlines
04 Dec - 11 Dec Frontier Airlines
10 Dec - 15 Dec Frontier Airlines direct
31 Dec - 03 Jan Frontier Airlines
31 Dec - 03 Jan Frontier Airlines direct

Also check the deals for one-way flights from St. Louis to Cancun in December.

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