Cheapest return STL–CUN flights, August

AirHint found the following cheapest return flights from St. Louis (STL) to Cancun (CUN) in August 2026 (see full year).

Return flights

09 Aug - 14 Aug Frontier Airlines
09 Aug - 14 Aug Frontier Airlines direct
15 Aug - 20 Aug Frontier Airlines
10 Aug - 15 Aug Frontier Airlines
20 Aug - 24 Aug Frontier Airlines
10 Aug - 15 Aug Frontier Airlines direct
15 Aug - 15 Aug Frontier Airlines
31 Aug - 05 Sep Frontier Airlines
15 Aug - 20 Aug Southwest Airlines direct
31 Aug - 05 Sep Southwest Airlines direct
20 Aug - 24 Aug Southwest Airlines direct

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

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