Cheapest one-way flights from St. Louis to Cancun in May from $121

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

One-Way flights

11 May Frontier Airlines direct
09 May Frontier Airlines
16 May American Airlines
16 May Frontier Airlines direct
09 May Frontier Airlines direct
26 May Air Canada
26 May Frontier Airlines direct

Also check the deals for return flights from St. Louis to Cancun in May.

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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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