Cheapest return flights from St. Louis to Cancun in August from $366

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

Return flights

15 Aug - 22 Aug Spirit Airlines
31 Aug - 04 Sep Frontier Airlines direct
15 Aug - 22 Aug Frontier Airlines direct
14 Aug - 21 Aug Frontier Airlines
29 Aug - 02 Sep Frontier Airlines direct
29 Aug - 01 Sep Volaris
14 Aug - 21 Aug Southwest Airlines direct
28 Aug - 01 Sep Frontier Airlines
29 Aug - 01 Sep Frontier Airlines direct
28 Aug - 01 Sep Frontier Airlines direct

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

Skyscanner

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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