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$113+ Cheap flights from St. Louis (STL) to Cancún (CUN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — CUN
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Cancun are usually found in September or April, booked 41 days in advance, depart on a Tuesday or Monday and return on a Thursday

Cheap flight deals from St. Louis to Cancún

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Cancún (CUN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 20, 2025.

Round-trip from

$246
(Cheapflightsfares)

One-way from

$113
(Cheapflightsfares)

Popular in

March

Cheapest in

September

Average price

$466

Good round-trip deal

$322 or less

Good one-way deal

$189 or less
From Lambert-St Louis to Cancun
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One-way flight from Lambert-St Louis to Cancun
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Highest demand for flights based on searches. 3% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Lambert-St Louis to Cancun.
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Price to beat on a one-way flight from Lambert-St Louis to Cancun.
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Find flight deals from St. Louis to Cancún

Cheapest flights from St. Louis to Cancún
Explore the most affordable flight options available from St. Louis to Cancún. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1110:21 amSTL - CUN
Nonstop3h 13mFrontier
Mon 9/152:49 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 8/19$246
This Frontier deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/1410:21 amSTL - CUN
Nonstop3h 13mFrontier
Sat 9/202:49 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 8/18$248
This Cheapflightsfares deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/810:21 amSTL - CUN
Nonstop3h 13mFrontier
Mon 9/152:49 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 8/19$263
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/210:26 amSTL - CUN
Nonstop3h 20mFrontier
Tue 9/92:49 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 8/19$277
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/810:21 amSTL - CUN
Nonstop3h 13mFrontier
Sat 9/132:49 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 8/19$278
This Cheapflightsfares deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/710:21 amSTL - CUN
Nonstop3h 13mFrontier
Thu 9/112:49 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 8/18$279
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/410:21 amSTL - CUN
Nonstop3h 13mFrontier
Thu 10/92:50 pmCUN - STL
Nonstop3h 17mFrontier
Deal found 8/20$282
This Cheapflightsfares deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/510:21 amSTL - CUN
Nonstop3h 13mFrontier
Tue 9/92:49 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 8/18$283
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1710:21 amSTL - CUN
Nonstop3h 13mFrontier
Wed 9/242:49 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 8/18$284
This Cheapflightsfares deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2410:22 amSTL - CUN
Nonstop3h 13mFrontier
Mon 10/272:50 pmCUN - STL
Nonstop3h 17mFrontier
Deal found 8/19$285
This Cheapflightsfares deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2410:21 amSTL - CUN
Nonstop3h 13mFrontier
Sun 9/282:49 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 8/18$286
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1810:22 amSTL - CUN
Nonstop3h 13mFrontier
Thu 10/232:50 pmCUN - STL
Nonstop3h 17mFrontier
Deal found 8/19$289

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Cancún that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 20, 2025.
Use the filters below to find and compare flights from St. Louis to Cancún that are best for you.

Fly from

St. Louis

Fly to

Cancún

Route

Depart

Return

Price

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Thu 9/11

10:21 am-1:34 pm

Nonstop3h 13m

Cancun

Mon 9/15

2:49 pm-6:10 pm

Nonstop3h 21m

$246

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sun 9/14

10:21 am-1:34 pm

Nonstop3h 13m

Cancun

Mon 9/22

2:49 pm-6:10 pm

Nonstop3h 21m

$246

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sun 10/26

10:22 am-1:35 pm

Nonstop3h 13m

Cancun

Sun 11/2

3:45 pm-6:00 pm

Nonstop3h 15m

$246

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sun 10/19

10:22 am-1:35 pm

Nonstop3h 13m

Cancun

Thu 10/30

3:45 pm-7:00 pm

Nonstop3h 15m

$248

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Mon 9/8

10:21 am-1:34 pm

Nonstop3h 13m

Cancun

Mon 9/15

2:49 pm-6:10 pm

Nonstop3h 21m

$277

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sun 9/7

10:21 am-1:34 pm

Nonstop3h 13m

Cancun

Thu 9/11

2:49 pm-6:10 pm

Nonstop3h 21m

$279

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sat 10/4

10:21 am-1:34 pm

Nonstop3h 13m

Cancun

Thu 10/9

2:50 pm-6:07 pm

Nonstop3h 17m

$282

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Fri 9/5

10:21 am-1:34 pm

Nonstop3h 13m

Cancun

Tue 9/9

2:49 pm-6:10 pm

Nonstop3h 21m

$283

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Fri 10/24

10:22 am-1:35 pm

Nonstop3h 13m

Cancun

Mon 10/27

2:50 pm-6:07 pm

Nonstop3h 17m

$285

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Mon 11/3

10:17 am-2:30 pm

Nonstop3h 13m

$113

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 14 results
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The best insider tips for St. Louis to Cancún flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Cancún trip
Airports
STL

Expect security screening at STL to take 5 to 10 minutes during off-peak times. Check real-time wait times online before heading to the airport.

Read more about STLby Taryn White
CUN

For a stress-free arrival at CUN, arrange a hotel transfer in advance. Avoid taxi scammers by agreeing on the price before getting in the car.

Read more about CUNby Ramsey Qubein
Our travel experts
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on CUN

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Best time to book a flight from St. Louis to Cancún

Have a flexible travel schedule? Discover the best time to fly to Cancún from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Cancún

How far ahead should I book a flight from St. Louis to Cancún?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Cancún. Price data was last updated on August 8, 2025.

The price you pay for your flight from St. Louis to Cancún may vary depending on when you book. For the best chance of a lower fare, look to book 41 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from St. Louis to Cancún?

Currently, January is the cheapest month in which you can book a flight from St. Louis to Cancún (average of $360). Flying from St. Louis to Cancún in March is currently the most expensive (average of $492). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to CUN?

Find hourly flight availability from St. Louis to Cancún. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 20, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 57% on flights from St. Louis to Cancún by exploring options for tickets in the evening.

What is the cheapest day to fly from St. Louis to Cancún?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Cancún. Price data was last updated on August 17, 2025.

Travelers seeking maximum savings on their St. Louis to Cancún flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from St. Louis to Cancún?

Reviews of airlines servicing Cancún

Get insights into the airlines that provide service to Cancún. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Cancún. Reviews last updated August 20, 2025.
Get a feel of what it's like to fly with Southwest, United Airlines, and American Airlines from St. Louis to Cancún by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,928 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Volaris
6.6
Okay
1,161 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,207 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Cancún. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this St. Louis to Cancún flight route?

    Within the past month, 22 users have taken a look at flights from Lambert-St Louis to Cancun.

  • How long is the flight from St. Louis to Cancún?

    A quick flight from St. Louis to Cancún can take about 3h 13m. Frontier provides one of the quickest options available for as low as $246. There are 1241 mi between St. Louis and Cancún. All flights are typically nonstop.

  • What are the cheapest airlines flying from St. Louis to Cancún round-trip?

    Our cheapest airline available from St. Louis to Cancún is Spirit Airlines. Our recent data shows that you can find tickets from as low as $132 on this airline. Additional options worth looking into are Volaris and Frontier, starting at $174 and $270 round-trip. Spirit Airlines is 74% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest flights from St. Louis to Cancún?

    Looking at all options, your cheapest flight can be booked for $174. While the most popular route (Lambert-St Louis - Cancun) can be booked for $281 on average our data indicates $344 when flying from St. Louis to Cancún.

  • Can I find deals for flights from St. Louis to Cancún that include hotel bookings?

    Yes. In addition to deals on St. Louis to Cancún flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Cancún?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Cancún.

  • Can I find deals for business class flights from St. Louis to Cancún?

    Yes. Cheapflights offers flight deals from St. Louis to Cancún by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Cancún?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Cancún (average of $360). Flying from St. Louis to Cancún in March is currently the most expensive (average of $492). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Cancún?

Book flights to Cancún if you plan to visit one of these locations
Puerto Aventuras
Holbox
Punta Sam

Browse thousands of different options on Cheapflights for your next trip

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Top 8 airlines flying from St. Louis to Cancún

Discover the top 8 airlines that operate flights from St. Louis to Cancún. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$132Average$293FlexibilityNo cancel feeOn-time65%
VolarisCheapest$174Average$364FlexibilityNo cancel feeOn-time79%
FrontierCheapest$270Average$476FlexibilityNo cancel feeOn-time62%
AeromexicoCheapest$342Average$500FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$358Average$562FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$449Average$576FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$481Average$609FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$507Average$670FlexibilityNo cancel feeOn-time63%

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