Cheapest return STL–CUN flights, May

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

Return flights

27 May - 02 Jun Frontier Airlines
31 May - 03 Jun Frontier Airlines
26 May - 02 Jun Frontier Airlines
26 May - 01 Jun Frontier Airlines
15 May - 17 May Frontier Airlines
15 May - 18 May Frontier Airlines
27 May - 31 May Frontier Airlines
27 May - 30 May Frontier Airlines
11 May - 25 May Frontier Airlines
22 May - 26 May Frontier Airlines
11 May - 13 May Frontier Airlines direct
05 May - 13 May Frontier Airlines direct
03 May - 15 May Frontier Airlines
16 May - 17 May Frontier Airlines

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

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