$120+ 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 5/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — CUN
May 23 — May 301
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Cancún with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Lambert-St Louis to Cancun are usually found in September or October, booked 42 days in advance, depart on a Monday or Wednesday and return on a Thursday
Cheap flight deals from St. Louis to Cancún
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to CancúnExplore 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 April 23, 2026.
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 April 23, 2026.
This FlightHub deal was found by Cheapflights users on 4/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:55 pm
STL
- CUN
1 stop19h 12m
Frontier
Thu 5/143:22 pm
CUN
- STL
1 stop17h 33m
Frontier
Deal found 4/20![Frontier logo]()
$302
This Frontier deal was found by Cheapflights users on 4/22. 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.
Thu 5/146:00 am
STL
- CUN
Nonstop3h 15m
Frontier
Wed 5/2011:13 am
CUN
- STL
Nonstop3h 26m
Frontier
Deal found 4/22![Frontier logo]()
$313
This Frontier deal was found by Cheapflights users on 4/22. 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 5/166:00 am
STL
- CUN
Nonstop3h 15m
Frontier
Tue 5/1911:13 am
CUN
- STL
Nonstop3h 26m
Frontier
Deal found 4/22![Frontier logo]()
$315
This Kiwi.com deal was found by Cheapflights users on 4/22. 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.
Thu 5/146:00 am
STL
- CUN
Nonstop3h 15m
Frontier
Sat 5/2311:05 am
CUN
- STL
1 stop8h 26m
Frontier
Deal found 4/22![Frontier logo]()
$321
This Frontier deal was found by Cheapflights users on 4/22. 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 5/156:00 am
STL
- CUN
Nonstop3h 15m
Frontier
Thu 5/2111:13 am
CUN
- STL
Nonstop3h 26m
Frontier
Deal found 4/22![Frontier logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 4/19. 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.
Fri 5/155:27 pm
STL
- CUN
2 stops40h 36m
Frontier
Sat 5/233:39 pm
CUN
- STL
1 stop27h 44m
Frontier
Deal found 4/19![Frontier logo]()
$325
This Expedia deal was found by Cheapflights users on 4/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/136:00 am
STL
- CUN
Nonstop3h 15m
Frontier
Sun 5/1711:13 am
CUN
- STL
Nonstop3h 26m
Frontier
Deal found 4/21![Frontier logo]()
$328
This FlightHub deal was found by Cheapflights users on 4/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
STL
- CUN
Nonstop3h 15m
Frontier
Thu 5/283:39 pm
CUN
- STL
1 stop27h 44m
Frontier
Deal found 4/21![Frontier logo]()
$336
This Priceline deal was found by Cheapflights users on 4/18. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:33 pm
STL
- CUN
1 stop19h 34m
Frontier
Fri 5/293:22 pm
CUN
- STL
1 stop17h 33m
Frontier
Deal found 4/18![Frontier logo]()
$337
This Kiwi.com deal was found by Cheapflights users on 4/19. 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.
Thu 5/73:33 pm
STL
- CUN
1 stop20h 47m
Multiple Airlines
Thu 5/143:22 pm
CUN
- STL
1 stop17h 33m
Multiple Airlines
Deal found 4/19![Multiple Airlines logo]()
$338
Best flights from St. Louis to CancúnDiscover carefully curated flight deals from St. Louis to Cancún that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 23, 2026.
Discover carefully curated flight deals from St. Louis to Cancún that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 23, 2026.
This Delta deal was found by Cheapflights users on 4/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/106:00 am
STL
- CUN
2 stops12h 35m
Delta
Fri 5/158:00 am
CUN
- STL
1 stop9h 56m
Delta
Deal found 4/20![Delta logo]()
$398
This United Airlines deal was found by Cheapflights users on 4/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/278:00 am
STL
- CUN
1 stop6h 26m
United Airlines
Sun 10/47:51 am
CUN
- STL
1 stop9h 10m
United Airlines
Deal found 4/18![United Airlines logo]()
$593
This Southwest deal was found by Cheapflights users on 4/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/295:40 am
STL
- CUN
2 stops10h 30m
Southwest
Wed 8/512:50 pm
CUN
- STL
2 stops10h 50m
Southwest
Deal found 4/22![Southwest logo]()
$612
This Delta deal was found by Cheapflights users on 4/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/127:20 am
STL
- CUN
2 stops12h 07m
Delta
Tue 8/182:00 pm
CUN
- STL
1 stop9h 37m
Delta
Deal found 4/20![Delta logo]()
$486
This Southwest deal was found by Cheapflights users on 4/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/15:40 am
STL
- CUN
2 stops9h 25m
Southwest
Thu 6/41:00 pm
CUN
- STL
2 stops10h 10m
Southwest
Deal found 4/22![Southwest logo]()
$632
This Delta deal was found by Cheapflights users on 4/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/107:08 am
STL
- CUN
1 stop13h 07m
Delta
Tue 7/1412:25 pm
CUN
- STL
2 stops11h 28m
Delta
Deal found 4/18![Delta logo]()
$632
This Southwest deal was found by Cheapflights users on 4/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/185:40 am
STL
- CUN
1 stop8h 20m
Southwest
Sat 7/2511:50 am
CUN
- STL
2 stops11h 20m
Southwest
Deal found 4/22![Southwest logo]()
$668
This Delta deal was found by Cheapflights users on 4/22. 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.
Wed 7/159:24 am
STL
- CUN
1 stop5h 12m
Delta
Sat 7/1811:00 am
CUN
- STL
1 stop10h 37m
Delta
Deal found 4/22![Delta logo]()
$638
This Delta deal was found by Cheapflights users on 4/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/101:30 pm
STL
- CUN
2 stops10h 52m
Delta
Wed 10/142:00 pm
CUN
- STL
1 stop9h 39m
Delta
Deal found 4/18![Delta logo]()
$653
This Delta deal was found by Cheapflights users on 4/21. 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.
Thu 5/77:05 am
STL
- CUN
2 stops12h 38m
Delta
Thu 5/1412:37 pm
CUN
- STL
2 stops11h 22m
Delta
Deal found 4/21![Delta logo]()
$661
Last-minute flights from St. Louis to CancúnDiscover last-minute flight deals from St. Louis to Cancún. Data last updated April 23, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Cancún. Data last updated April 23, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 4/19. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:23 pm
STL
- CUN
1 stop16h 23m
Frontier
Fri 5/83:22 pm
CUN
- STL
1 stop17h 33m
Frontier
Deal found 4/19![Frontier logo]()
$340
This Gotogate deal was found by Cheapflights users on 4/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/37:05 am
STL
- CUN
2 stops13h 55m
Multiple Airlines
Sat 5/95:07 pm
CUN
- STL
1 stop7h 14m
Multiple Airlines
Deal found 4/19![Multiple Airlines logo]()
$373
This Priceline deal was found by Cheapflights users on 4/19. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/311:28 am
STL
- CUN
1 stop27h 28m
Frontier
Sun 5/1011:13 am
CUN
- STL
Nonstop3h 26m
Frontier
Deal found 4/19![Frontier logo]()
$383
This Super.com deal was found by Cheapflights users on 4/19. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/36:00 am
STL
- CUN
Nonstop3h 17m
Frontier
Sat 5/95:07 pm
CUN
- STL
1 stop7h 14m
Frontier
Deal found 4/19![Frontier logo]()
$393
This Kiwi.com deal was found by Cheapflights users on 4/19. 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.
Sun 5/311:28 am
STL
- CUN
2 stops22h 11m
Multiple Airlines
Sun 5/103:22 pm
CUN
- STL
1 stop17h 33m
Multiple Airlines
Deal found 4/19![Multiple Airlines logo]()
$518
This Delta deal was found by Cheapflights users on 4/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/36:20 am
STL
- CUN
2 stops12h 15m
Delta
Sun 5/1011:22 am
CUN
- STL
2 stops12h 37m
Delta
Deal found 4/19![Delta logo]()
$545
One-way flights from St. Louis to CancúnSearch for one-way flight options from St. Louis to Cancún. Find affordable one-way fares based on user searches. Data last updated April 23, 2026.
Search for one-way flight options from St. Louis to Cancún. Find affordable one-way fares based on user searches. Data last updated April 23, 2026.
This Frontier deal was found by Cheapflights users on 4/22. 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.
Mon 5/186:00 am
STL
- CUN
Nonstop3h 15m
Frontier
Deal found 4/22![Frontier logo]()
$120
This Expedia deal was found by Cheapflights users on 4/22. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/154:19 pm
STL
- CUN
1 stop23h 38m
Frontier
Deal found 4/22![Frontier logo]()
$131
This Priceline deal was found by Cheapflights users on 4/21. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/84:19 pm
STL
- CUN
1 stop23h 38m
Frontier
Deal found 4/21![Frontier logo]()
$141
This Priceline deal was found by Cheapflights users on 4/21. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:55 pm
STL
- CUN
1 stop19h 12m
Frontier
Deal found 4/21![Frontier logo]()
$147
This FlightHub deal was found by Cheapflights users on 4/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/176:55 pm
STL
- CUN
1 stop19h 12m
Frontier
Deal found 4/19![Frontier logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 4/20. 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.
Sun 6/217:03 pm
STL
- CUN
1 stop14h 48m
Frontier
Deal found 4/20![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 4/22. 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.
Sun 5/248:08 pm
STL
- CUN
1 stop15h 56m
Frontier
Deal found 4/22![Frontier logo]()
$171
This Super.com deal was found by Cheapflights users on 4/22. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:08 pm
STL
- CUN
1 stop16h 41m
Frontier
Deal found 4/22![Frontier logo]()
$172
This Travelocity deal was found by Cheapflights users on 4/22. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/108:08 pm
STL
- CUN
1 stop16h 40m
Frontier
Deal found 4/22![Frontier logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 4/21. 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 6/238:08 pm
STL
- CUN
1 stop16h 40m
Frontier
Deal found 4/21![Frontier logo]()
$175
Find 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 April 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $302 (FlightHub) |
One-way from | $120 (Frontier) |
Popular in | June |
Cheapest in | September |
Average price | $463 |
Good round-trip deal | $439 or less |
Good one-way deal | $289 or less |
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 April 23, 2026.
Use the filters below to find and compare flights from St. Louis to Cancún that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Sun 5/10
6:00 am-6:35 pm
2 stops12h 35m
Cancun
Fri 5/15
8:00 am-5:56 pm
1 stop9h 56m
$398
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Wed 8/12
7:20 am-7:27 pm
2 stops12h 07m
Cancun
Tue 8/18
2:00 pm-11:37 pm
1 stop9h 37m
$486
Quickest round-trip
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Sun 9/27
8:00 am-2:26 pm
1 stop6h 26m
Cancun
Sun 10/4
7:51 am-5:01 pm
1 stop9h 10m
$593
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Wed 7/29
5:40 am-4:10 pm
2 stops10h 30m
Cancun
Wed 8/5
12:50 pm-11:40 pm
2 stops10h 50m
$612
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Mon 6/1
5:40 am-3:05 pm
2 stops9h 25m
Cancun
Thu 6/4
1:00 pm-11:10 pm
2 stops10h 10m
$632
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Fri 7/10
7:08 am-8:15 pm
1 stop13h 07m
Cancun
Tue 7/14
12:25 pm-11:53 pm
2 stops11h 28m
$632
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Wed 7/15
9:24 am-2:36 pm
1 stop5h 12m
Cancun
Sat 7/18
11:00 am-9:37 pm
1 stop10h 37m
$638
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Sat 10/10
1:30 pm-12:22 am
2 stops10h 52m
Cancun
Wed 10/14
2:00 pm-11:39 pm
1 stop9h 39m
$653
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Thu 5/7
7:05 am-7:43 pm
2 stops12h 38m
Cancun
Thu 5/14
12:37 pm-11:59 pm
2 stops11h 22m
$661
St. LouisCancún
STL - CUN
STLCUN
Lambert-St Louis
Sat 7/18
5:40 am-2:00 pm
1 stop8h 20m
Cancun
Sat 7/25
11:50 am-11:10 pm
2 stops11h 20m
$668
Showing 1-10 of 18 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Cancún
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Cancún in April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Cancún flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Cancún flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Cancún flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Cancún flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Cancún flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
STL-CUN
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
Prices
Airlines
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 April 17, 2026.
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 42 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, September is the cheapest month in which you can book a flight from St. Louis to Cancún (average of $326). Flying from St. Louis to Cancún in June is currently the most expensive (average of $571). 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 April 23, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Cancún as you normally would.
The best insider tips for St. Louis to Cancún flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your St. Louis to Cancún trip
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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 April 23, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andAmerican 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.
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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.
Traveling to a place near Cancún?
Book flights to Cancún if you plan to visit one of these locationsPuerto Aventuras
Punta Sam
Holbox
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Alternative routes for St. Louis to Cancún
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Other flights to Cancún
Explore flights to Cancún departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on April 23, 2026.
Complete your trip
Complete your trip to Cancún by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Cancún by cabin class
Find flights from St. Louis to Cancún, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Cancún flights
Browse other St. Louis and Cancún flight options. Last updated on April 23, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on April 23, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 April 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$168 | Average$480 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$182 | Average$375 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$219 | Average$408 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$481 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$330 | Average$551 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$404 | Average$468 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$411 | Average$625 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$477 | Average$632 | FlexibilityNo cancel fee | On-time63% |