$183 Cheap Flights from Cancun (CUN) to St. Louis (STL)

View $183 flight on Tue, Aug 12, 2025Opens in a new window

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

Prices were available within the past 7 days and start at $183 for one-way flights and $317 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Wed, Aug 27 - Tue, Sep 9
CUN
Cancun
STL
St. Louis
$317 Roundtrip, found 13 hours ago
$317
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Wed, Aug 27 from Cancun to St. Louis, returning Tue, Sep 9, priced at $317 found 13 hours ago
Frontier Airlines
Wed, Aug 27 - Sat, Sep 6
CUN
Cancun
STL
St. Louis
$322 Roundtrip, found 13 hours ago
$322
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Wed, Aug 27 from Cancun to St. Louis, returning Sat, Sep 6, priced at $322 found 13 hours ago
Frontier Airlines
Wed, Aug 27 - Mon, Sep 8
CUN
Cancun
STL
St. Louis
$328 Roundtrip, found 13 hours ago
$328
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Wed, Aug 27 from Cancun to St. Louis, returning Mon, Sep 8, priced at $328 found 13 hours ago
Frontier Airlines
Thu, Aug 14 - Tue, Aug 19
CUN
Cancun
STL
St. Louis
$333 Roundtrip, found 13 hours ago
$333
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Cancun to St. Louis, returning Tue, Aug 19, priced at $333 found 13 hours ago
Frontier Airlines
Thu, Aug 14 - Sat, Aug 23
CUN
Cancun
STL
St. Louis
$338 Roundtrip, found 13 hours ago
$338
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Cancun to St. Louis, returning Sat, Aug 23, priced at $338 found 13 hours ago
Frontier Airlines
Thu, Aug 14 - Thu, Aug 21
CUN
Cancun
STL
St. Louis
$343 Roundtrip, found 13 hours ago
$343
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Thu, Aug 14 from Cancun to St. Louis, returning Thu, Aug 21, priced at $343 found 13 hours ago
Southwest Airlines
Wed, Oct 29 - Sun, Nov 2
CUN
Cancun
STL
St. Louis
$359 Roundtrip, found 2 days ago
$359
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Wed, Oct 29 from Cancun to St. Louis, returning Sun, Nov 2, priced at $359 found 2 days ago
Aeromexico
Tue, Aug 26 - Sun, Aug 31
CUN
Cancun
STL
St. Louis
$413 Roundtrip, found 3 days ago
$413
Roundtrip
found 3 days ago
Select Aeromexico flight, departing Tue, Aug 26 from Cancun to St. Louis, returning Sun, Aug 31, priced at $413 found 3 days ago
Delta
Tue, Aug 26 - Sun, Aug 31
CUN
Cancun
STL
St. Louis
$413 Roundtrip, found 3 days ago
$413
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Aug 26 from Cancun to St. Louis, returning Sun, Aug 31, priced at $413 found 3 days ago
United
Thu, Aug 28 - Sun, Aug 31
CUN
Cancun
STL
St. Louis
$413 Roundtrip, found 3 days ago
$413
Roundtrip
found 3 days ago
Select United flight, departing Thu, Aug 28 from Cancun to St. Louis, returning Sun, Aug 31, priced at $413 found 3 days ago
Flights from Cancun (CUN) to St. Louis (STL)
Origin airport
Cancun Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Aeromexico, Air Canada, Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$317
Distance
1240 mi
Average flight time
3 hours 12 mins

Cancun to St. Louis Flights

The cheapest times to fly from Cancun to St. Louis

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 Cancun to St. Louis are during the month of August. You can find some of the cheapest flights from Cancun to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Cancun to St. Louis: 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 Cancun to St. Louis

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 Cancun to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $183 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 Cancun to St. Louis 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 Cancun to St. Louis 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 Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL) cost?
Score cheap return tickets from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL) starting at $348. Grab your seat and take off on your trip. 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 CUN on August 2 2025 and touching down at STL. The price was last updated on July 10 2025 and has not changed since.
What is the cheapest month to fly from CUN to STL?
The cheapest flights from CUN to STL 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 Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
You can choose from 3 carriers that fly nonstop from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL). These include:

  • Southwest Airlines
  • Frontier Airlines
  • American Airlines

What is the cheapest airline that flies from CUN to STL?
With prices as low as $214 for a one-way flight from CUN to STL, Southwest 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 CUN on September 11 2025. Prices were last updated on July 10 2025 and have not changed since.
How many flights per day from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
With, on average, 2 nonstop flights that operate from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL) each day, you'll be soaring through the skies in no time.
What are the most popular departure times for flights from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
More people fly between CUN and STL at 12 PM than at any other time. Looking to skip the crowds? Travel outside of rush hours and you could save on your ticket as well.
What day of the week has the most flights from CUN to STL?
Depart on a Saturday if you're looking for the best choice of flights from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL).
What is the earliest flight from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
The earliest flight departing from Cancun Intl. Airport (CUN) is at around 12:21PM UTC-5. Catch this flight and you'll land at Lambert-St. Louis Intl. Airport (STL) at approximately 2:44PM UTC-6. The total travel time is 3h 23m.
How long does it take to fly from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
Flights from CUN to STL have an average travel time of 3 hours and 22 minutes. The total distance between these two airports is 1,250 mi.
What airline has the least delays from CUN to STL?
Frontier Airlines has the best track record for on-time direct flights from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL), with an on-time rating of 91%. Use the Expedia App to check your flight schedule before you leave and get real-time updates about any trip changes.
What is the best time to fly from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL) route, aim to fly before 3 PM. Later departures have a 22% higher chance of being canceled.**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 St. Louis from Cancun Intl. Airport (CUN)?
Compare your flight options from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL). This is the only St. Louis airport you can touch down at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute fares from CUN to STL are usually more expensive. To lock in the lowest prices, start searching for flights as soon as possible. That being said, if you're flexible with your travel dates, it's possible to land a cheap ticket right before your journey.
Is it cheaper to book a CUN to STL flight and hotel package?
Booking a CUN to STL flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Choose from our impressive range of accommodations and then add activities, car rentals and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you're able to reschedule or cancel your CUN to STL flight. However, there may be additional charges, especially if you made your booking over 24 hours ago. Check your itinerary for the airline's fees and rules on flight changes, or if you'd like more information, visit our Customer Service portal.

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