Cheap flights from St. Louis to Cancún from $170

If you don’t want to visit Cancún in December, then you should wait until November to fly from St. Louis, when ticket prices are also cheap, with an average price of $417.

The cheapest day to depart from St. Louis to Cancún is on a Wednesday when prices can be found for as low as $443. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $536. These prices are subject to change though, so be sure to set up a Price Alert for flights to Cancún.

Our most recent data shows that the best time of day to fly to Cancún is in the morning. Flights from St. Louis to Cancún during this time can be as low as $496. Flights to Cancún are more costly in the afternoon, with an average ticket price of $649. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Lambert-St Louis to Cancun for the best Lambert-St Louis - Cancun flight prices

You are more likely to see cheaper flights to Cancún from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Cancún for around $519 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Cancún from St. Louis for as low as $450 on momondo.

There are 4 cabin classes available to choose from on St. Louis to Cancún flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 14% on your flight if you consider stops on a St. Louis to Cancún flight.

As of September 2026, prices for St. Louis to Cancún flights are approximately 31% more expensive when compared to flights at the same time last year.

United Airlines, Delta, and American Airlines are the most popular carriers operating from Lambert-St Louis to Cancun

Frontier, Southwest and American Airlines are the top three most popular airlines that fly to Cancún from St. Louis according to our data. Frontier is the first choice among our users, with 50% of people opting to fly with this airline when traveling to Cancún. Keep in mind that there are 9 different airlines that fly to Cancún on a routine basis, so you have a few additional options to choose from.

Atlanta (ATL) was the most common stop: 33% of momondo users choosing 1-stop flights on this route connected there.

Flights via Atlanta (ATL) offer the lowest average round-trip price of $355.

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 5h 12m.

Atlanta (ATL) has the shortest average layover time for this route: 1h 15m.