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

One-Way flights

14 Dec	Frontier Airlines	direct
08 Dec	Frontier Airlines	direct
15 Dec	Frontier Airlines	direct
04 Dec	Spirit Airlines
09 Dec	Frontier Airlines	direct
30 Dec	Aeromexico
30 Dec	Frontier Airlines	direct
07 Dec	Frontier Airlines	direct
05 Dec	Frontier Airlines	direct
10 Dec	Frontier Airlines	direct

Also check the deals for return 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 one-way flights from St. Louis to Cancun in December from 97€

One-Way flights