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

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

One-Way flights

25 Aug Spirit Airlines
15 Aug Spirit Airlines
08 Aug Spirit Airlines
11 Aug Spirit Airlines
04 Aug Frontier Airlines
16 Aug Frontier Airlines
13 Aug Frontier Airlines
25 Aug Frontier Airlines direct
11 Aug Frontier Airlines direct
10 Aug Frontier Airlines direct

Also check the deals for return 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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