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

Return flights

07 Dec - 11 Dec	Frontier Airlines	direct
07 Dec - 12 Dec	Frontier Airlines	direct
10 Dec - 15 Dec	Delta
05 Dec - 09 Dec	Frontier Airlines	direct
04 Dec - 08 Dec	Spirit Airlines
11 Dec - 15 Dec	Delta
04 Dec - 08 Dec	Frontier Airlines	direct
10 Dec - 15 Dec	Southwest Airlines	direct
03 Dec - 07 Dec	Frontier Airlines
19 Dec - 23 Dec	Frontier Airlines	direct
31 Dec - 05 Jan	United
31 Dec - 04 Jan	Aeromexico
31 Dec - 04 Jan	Southwest Airlines	direct
30 Dec - 03 Jan	Delta

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 207€

Return flights