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

Return flights

30 Dec - 31 Dec	Delta
31 Dec - 07 Jan	Air Canada
29 Dec - 01 Jan	Aeromexico
30 Dec - 06 Jan	Delta
30 Dec - 02 Jan	Delta
29 Dec - 01 Jan	Frontier Airlines	direct
30 Dec - 31 Dec	Frontier Airlines	direct
30 Dec - 02 Jan	Frontier Airlines	direct
31 Dec - 03 Jan	Aeromexico
31 Dec - 04 Jan	Aeromexico
30 Dec - 06 Jan	Southwest Airlines	direct
31 Dec - 07 Jan	Southwest Airlines	direct

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.

Book a cheap hotel in Cancun

Cheap car rent in Cancun

Cheapest return flights from St. Louis to Cancun in December from 389€

Return flights