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

Return flights

04 Dec - 11 Dec	Frontier Airlines	direct
07 Dec - 11 Dec	Frontier Airlines	direct
07 Dec - 12 Dec	Frontier Airlines	direct
22 Dec - 29 Dec	Frontier Airlines	direct
21 Dec - 27 Dec	Frontier Airlines	direct
10 Dec - 15 Dec	Frontier Airlines
22 Dec - 05 Jan	Frontier Airlines
22 Dec - 05 Jan	Frontier Airlines	direct
26 Dec - 02 Jan	Frontier Airlines

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

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from St. Louis to Cancun in December from 298€

Return flights