Cheap flights from St. Louis to Cancún from $173

If you don’t want to visit Cancún in January, then you should wait until December to fly from St. Louis, when ticket prices are also cheap, with an average price of $474.

The cheapest day to depart from St. Louis to Cancún is on a Tuesday when prices can be found for as low as $493. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $587. 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 $540. Flights to Cancún are more costly at noon, with an average ticket price of $577. Departure times at noon 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 $566 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 $493 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 29% on your flight if you consider stops on a St. Louis to Cancún flight.

As of November 2026, prices for St. Louis to Cancún flights are approximately 17% cheaper when compared to flights at the same time last year.

Frontier, American Airlines, and Delta 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 47% 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.

Houston (IAH) was the most common stop: 25% of momondo users choosing 1-stop flights on this route connected there.

Flights via Orlando (MCO) offer the lowest average round-trip price of $381.

Flights connecting via Charlotte (CLT) have the shortest average one-way travel time: 5h 36m.

Charlotte (CLT) has the shortest average layover time for this route: 1h 22m.

As of November 2026, there are 2 flights per day flying from St. Louis to Cancún. The most common time of day flights depart is 6:00AM, with 100% of flights taking off at noon.

16 flights are operational weekly from St. Louis to Cancún as of November 2026. The most popular departure day for this route is Mon, with 19% of flights per week taking off on this day.