St. Louis

$137+ Cheap flights from Cancún (CUN) to St. Louis (STL)

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 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
CUN — STL
Aug 19 — Aug 261
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Cheap flight deals from Cancún to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Cancún (CUN) to St. Louis (STL). 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 14, 2025.

Round-trip from

$202
(Kiwi.com)

One-way from

$137
(Cheapflightsfares)

Popular in

January

Cheapest in

August

Average price

$273

Good round-trip deal

$112 or less

Good one-way deal

$236 or less
From Cancun to Lambert-St Louis
One-way flight from Cancun to Lambert-St Louis
Highest demand for flights based on searches. 24% potential increase in price ($144 potential increase over avg. RT price).
Cheapest flight prices on average. 5% potential price decrease ($25 potential savings vs. average RT price).
Average for round-trip flights in August 2025
Price to beat on a round-trip flight from Cancun to Lambert-St Louis.
Price to beat on a one-way flight from Cancun to Lambert-St Louis.

Find flight deals from Cancún to St. Louis

Cheapest flights from Cancún to St. Louis
Explore the most affordable flight options available from Cancún to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Kiwi.com deal was found by Cheapflights users on 8/12. 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.
Fri 9/52:49 pmCUN - STL
Nonstop3h 21mFrontier
Mon 9/810:21 amSTL - CUN
Nonstop3h 13mFrontier
Deal found 8/12$202
This Frontier deal was found by Cheapflights users on 8/13. 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.
Fri 9/122:49 pmCUN - STL
Nonstop3h 21mFrontier
Tue 9/1610:21 amSTL - CUN
Nonstop3h 13mFrontier
Deal found 8/13$242
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 9/62:49 pmCUN - STL
Nonstop3h 21mFrontier
Mon 9/810:21 amSTL - CUN
Nonstop3h 13mFrontier
Deal found 8/12$260
This Frontier deal was found by Cheapflights users on 8/13. 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.
Sat 9/272:49 pmCUN - STL
Nonstop3h 21mFrontier
Sat 10/410:21 amSTL - CUN
Nonstop3h 13mFrontier
Deal found 8/13$313
This United Airlines deal was found by Cheapflights users on 8/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/237:51 amCUN - STL
2 stops16h 02mUnited Airlines
Tue 9/306:15 amSTL - CUN
1 stop8h 22mUnited Airlines
Deal found 8/13$315
This Delta deal was found by Cheapflights users on 8/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/122:00 pmCUN - STL
1 stop7h 15mDelta
Tue 9/1611:04 amSTL - CUN
1 stop9h 11mDelta
Deal found 8/13$319
This Kiwi.com deal was found by Cheapflights users on 8/12. 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.
Fri 9/52:49 pmCUN - STL
Nonstop3h 21mMultiple Airlines
Mon 9/87:55 pmSTL - CUN
2 stops25h 54mMultiple Airlines
Deal found 8/12$336
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 9/610:20 amCUN - STL
2 stops23h 20mMultiple Airlines
Mon 9/810:21 amSTL - CUN
Nonstop3h 13mMultiple Airlines
Deal found 8/12$338
This Delta deal was found by Cheapflights users on 8/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/59:10 amCUN - STL
2 stops14h 13mDelta
Mon 9/81:26 pmSTL - CUN
1 stop6h 54mDelta
Deal found 8/12$365
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 9/272:07 pmCUN - STL
1 stop19h 33mMultiple Airlines
Sat 10/410:21 amSTL - CUN
Nonstop3h 13mMultiple Airlines
Deal found 8/13$368

Cheapflights Fare Finder

 
Customize your flight search to find flights from Cancún to St. Louis 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 14, 2025.
Use the filters below to find and compare flights from Cancún to St. Louis that are best for you.

Fly from

Cancún

Fly to

St. Louis

Route

Depart

Return

Price

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Fri 9/5

2:49 pm-6:10 pm

Nonstop3h 21m

Lambert-St Louis

Mon 9/8

10:21 am-1:34 pm

Nonstop3h 13m

$202

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Fri 9/12

2:49 pm-6:10 pm

Nonstop3h 21m

Lambert-St Louis

Tue 9/16

10:21 am-1:34 pm

Nonstop3h 13m

$242

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Sat 9/6

2:49 pm-6:10 pm

Nonstop3h 21m

Lambert-St Louis

Mon 9/8

10:21 am-1:34 pm

Nonstop3h 13m

$260

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Sat 9/27

2:49 pm-6:10 pm

Nonstop3h 21m

Lambert-St Louis

Sat 10/4

10:21 am-1:34 pm

Nonstop3h 13m

$313

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Tue 9/23

7:51 am-11:53 pm

2 stops16h 02m

Lambert-St Louis

Tue 9/30

6:15 am-2:37 pm

1 stop8h 22m

$315

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Tue 9/23

8:00 am-4:05 pm

1 stop8h 05m

Lambert-St Louis

Tue 9/30

9:19 am-8:15 pm

1 stop10h 56m

$315

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Fri 9/12

2:00 pm-9:15 pm

1 stop7h 15m

Lambert-St Louis

Tue 9/16

11:04 am-8:15 pm

1 stop9h 11m

$319

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Fri 9/5

2:49 pm-6:10 pm

Nonstop3h 21m

Lambert-St Louis

Mon 9/8

7:55 pm-9:49 pm

2 stops25h 54m

$336

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Sat 9/6

10:20 am-9:40 am

2 stops23h 20m

Lambert-St Louis

Mon 9/8

10:21 am-1:34 pm

Nonstop3h 13m

$338

CancúnSt. Louis

CUN - STL

CUNSTL

Cancun

Thu 12/11

1:01 pm-3:26 pm

Nonstop3h 25m

$137

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 17 results
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The best insider tips for Cancún to St. Louis 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 Cancún to St. Louis trip
Airports
CUN

CUN's terminals are crowded, so arrive early to navigate security lines and packed areas efficiently.

Read more about CUNby Ramsey Qubein
STL

Use the MetroLink from STL for a convenient, economical ride to downtown St. Louis in about 40 minutes.

Read more about STLby Taryn White
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 Cancún to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Cancún 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 Cancún to St. Louis

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

Find hourly flight availability from Cancún to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

It’s optimal to fly from Cancún to St. Louis in the morning. By choosing this option you can save up to 34% on the cost of your flight, compared to a flight at noon.

Related info for your journey

Find useful and relevant information for your journey from Cancún to St. Louis. 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 Cancún to St. Louis flight route?

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

    Looking at all options, your cheapest flight can be booked for $100. While the most popular route (Cancun - Lambert-St Louis) can be booked for $302 on average our data indicates $195 when flying from Cancún to St. Louis.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Cancún to St. Louis 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 Cancún to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Cancún to St. Louis (average of $311). Flying from Cancún to St. Louis in March is currently the most expensive (average of $356). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Farmington
Festus

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