$181 Cheap American Airlines flights St. Louis (STL) to Cancun (CUN)

Make use of the "Price (lowest to highest)" filter on Expedia to find cheap American Airlines return flights from $306 from STL to CUN. Affordable one-way fares from $181 are available as well.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

To find cheap flights from STL to CUN with American Airlines, start searching about one month before your intended departure. You can save 17% when you lock in your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another helpful tip? Booking on Sunday offers average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.

Taking off from STL at 7:25AM UTC-6, the earliest American Airlines flight to CUN lands at 11:40AM UTC-5. Flying earlier in the day means you're less likely to encounter delays or cancellations.* Prefer a later start? The last American Airlines flight from STL to CUN departs at 7:25AM UTC-6 and touches down at 11:40AM UTC-5.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.