$109 Cheap Flights from St. Louis (STL) to Cancun (CUN)

View $109 flight on Thu, Jun 12, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from St. Louis to Cancun (STL-CUN)

Prices were available within the past 7 days and start at $109 for one-way flights and $271 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Thu, Jun 12 - Sun, Jun 15
STL
St. Louis
CUN
Cancun
$271 Roundtrip, found 3 hours ago
$271
Roundtrip
found 3 hours ago
Select Spirit Airlines flight, departing Thu, Jun 12 from St. Louis to Cancun, returning Sun, Jun 15, priced at $271 found 3 hours ago
Spirit Airlines
Sat, Jul 12 - Tue, Jul 22
STL
St. Louis
CUN
Cancun
$295 Roundtrip, found 4 hours ago
$295
Roundtrip
found 4 hours ago
Select Spirit Airlines flight, departing Sat, Jul 12 from St. Louis to Cancun, returning Tue, Jul 22, priced at $295 found 4 hours ago
Spirit Airlines
Fri, Jun 13 - Thu, Jun 19
STL
St. Louis
CUN
Cancun
$317 Roundtrip, just found
$317
Roundtrip
just found
Select Spirit Airlines flight, departing Fri, Jun 13 from St. Louis to Cancun, returning Thu, Jun 19, priced at $317 just found
Spirit Airlines
Thu, Jun 19 - Thu, Jun 26
STL
St. Louis
CUN
Cancun
$323 Roundtrip, found 10 hours ago
$323
Roundtrip
found 10 hours ago
Select Spirit Airlines flight, departing Thu, Jun 19 from St. Louis to Cancun, returning Thu, Jun 26, priced at $323 found 10 hours ago
Spirit Airlines
Thu, Jun 12 - Tue, Jun 17
STL
St. Louis
CUN
Cancun
$324 Roundtrip, found 1 hour ago
$324
Roundtrip
found 1 hour ago
Select Spirit Airlines flight, departing Thu, Jun 12 from St. Louis to Cancun, returning Tue, Jun 17, priced at $324 found 1 hour ago
Frontier Airlines
Sat, May 17 - Fri, Jun 13
STL
St. Louis
CUN
Cancun
$326 Roundtrip, found 3 days ago
$326
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sat, May 17 from St. Louis to Cancun, returning Fri, Jun 13, priced at $326 found 3 days ago
Frontier Airlines
Sat, May 17 - Fri, Jun 13
STL
St. Louis
CUN
Cancun
$326 Roundtrip, found 3 days ago
$326
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sat, May 17 from St. Louis to Cancun, returning Fri, Jun 13, priced at $326 found 3 days ago
Southwest Airlines
Fri, Jul 11 - Thu, Jul 17
STL
St. Louis
CUN
Cancun
$416 Roundtrip, found 5 hours ago
$416
Roundtrip
found 5 hours ago
Select Southwest Airlines flight, departing Fri, Jul 11 from St. Louis to Cancun, returning Thu, Jul 17, priced at $416 found 5 hours ago
United
Mon, Sep 29 - Thu, Oct 2
STL
St. Louis
CUN
Cancun
$461 Roundtrip, found 3 hours ago
$461
Roundtrip
found 3 hours ago
Select United flight, departing Mon, Sep 29 from St. Louis to Cancun, returning Thu, Oct 2, priced at $461 found 3 hours ago
Air Canada
Sat, Apr 26 - Wed, Apr 30
STL
St. Louis
CUN
Cancun
$531 Roundtrip, found 8 hours ago
$531
Roundtrip
found 8 hours ago
Select Air Canada flight, departing Sat, Apr 26 from St. Louis to Cancun, returning Wed, Apr 30, priced at $531 found 8 hours ago
Flights from St. Louis (STL) to Cancun (CUN)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Cancun Intl.
Airlines serving
Aeromexico, Air Canada, Alaska Airlines, American Airlines, Delta, Frontier Airlines, Funjet Vacations, Southwest Airlines, Spirit Airlines, United
Roundtrip price
$270
Distance
1240 mi

St. Louis to Cancun Flights

The cheapest times to fly from St. Louis to Cancun

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Cancun are during the month of June. You can find some of the cheapest flights from St. Louis to Cancun with Expedia's search tool and vast selection of airlines.

The best time to book a flight from St. Louis to Cancun

Sunday is one of the best days to book for cheap flights from St. Louis to Cancun: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

How to find cheap round-trip tickets from St. Louis to Cancun

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Cancun in 2025. You can also book with separate airlines for your outbound and return journeys, from $109 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Cancun flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Cancun airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

*Terms apply.

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN) cost?
Find affordable return tickets from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN) starting from $394. Snag a seat and get ready for takeoff. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving STL on May 19 2025 and touching down at CUN. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from STL to CUN?
The cheapest flights from STL to CUN are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN)?
Avoid the layovers and fly nonstop from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN) with 3 carriers, including:

  • Southwest Airlines
  • Frontier Airlines
  • American Airlines

What is the cheapest airline that flies from STL to CUN?
With prices starting from $185 for a one-way journey from STL to CUN, Frontier Airlines is currently the cheapest airline for this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from STL on July 13 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN)?
With an average of 2 nonstop flights that operate from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN) daily, you’ll be soaring through the skies in no time.
What are the most popular departure times for flights from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN)?
More people fly between STL and CUN at 6 AM than at any other point in the day. Looking to skip the crowds? Consider flying outside peak hours and you’re likely to save on your fare as well.
What day of the week has the most flights from STL to CUN?
If you depart on a Saturday, you’ll get the biggest range of options for flights from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN).
What is the earliest flight from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN)?
Lambert-St. Louis Intl. Airport (STL)’s first flight to Cancun Intl. Airport (CUN) departs at approximately 6:25AM UTC-6. With a flight time of 3h 25m, you’ll arrive at around 10:50AM UTC-5.
How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN)?
It takes around 3 hours and 22 minutes to cover the 1,250 mi from STL to CUN.
What airline has the least delays from STL to CUN?
Consider traveling with American Airlines if you’d like to fly straight from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN) without any interruptions. This airline has the strongest track record for punctuality, with an on-time performance of 96%. Want to be notified if anything changes? You can check your flight status using the Expedia App.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN)?
To reach Cancun Intl. Airport (CUN) on time, book a flight that leaves from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
What airports do you fly into for Cancun from Lambert-St. Louis Intl. Airport (STL)?
If you’re boarding a direct flight from Lambert-St. Louis Intl. Airport (STL) to Cancun, Cancun Intl. Airport (CUN) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN) last-minute?
Last-minute fares from STL to CUN are typically more expensive. To lock in the cheapest rates, start searching for flights ahead of time. That being said, if your travel plans are flexible, it’s possible to score a cheap fare right before your journey.
Is it cheaper to book a STL to CUN flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to CUN flight and hotel package with Expedia could lead to significant savings. Better still, managing everything in one place takes the hassle out of planning your trip. Simply secure your flights and choose from our wide range of hotels, then customize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Cancun Intl. Airport (CUN)?
If you reserved your STL to CUN flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

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*Available to One Key members.