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Cancún

$148+ 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 5/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — CUN
Jun 3 — Jun 101
Wed 6/3
Wed 6/10
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

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3. Compare prices and book

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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 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 May 4, 2026.

This Expedia deal was found by Cheapflights users on 5/1. 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.
Tue 6/238:08 pm
STL
-
CUN
1 stop16h 40m
Frontier
Mon 6/293:01 pm
CUN
-
STL
1 stop26h 29m
Frontier
Deal found 5/1$337
This Expedia deal was found by Cheapflights users on 4/29. 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.
Tue 5/127:05 am
STL
-
CUN
1 stop13h 05m
Multiple Airlines
Tue 5/1911:13 am
CUN
-
STL
Nonstop3h 26m
Multiple Airlines
Deal found 4/29$339
This Kiwi.com deal was found by Cheapflights users on 5/3. 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 5/235:27 pm
STL
-
CUN
2 stops39h 42m
Frontier
Tue 6/23:39 pm
CUN
-
STL
1 stop27h 44m
Frontier
Deal found 5/3$350
This Kiwi.com deal was found by Cheapflights users on 5/3. 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 8/153:34 pm
STL
-
CUN
1 stop18h 18m
Frontier
Tue 8/253:35 pm
CUN
-
STL
1 stop27h 48m
Frontier
Deal found 5/3$354
This CheapOair deal was found by Cheapflights users on 5/1. 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 CheapOair 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
Thu 5/283:39 pm
CUN
-
STL
1 stop27h 44m
Frontier
Deal found 5/1$358
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 8/48:08 pm
STL
-
CUN
1 stop16h 41m
Frontier
Thu 8/1311:04 am
CUN
-
STL
Nonstop3h 19m
Frontier
Deal found 4/30$360
This CheapOair deal was found by Cheapflights users on 4/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/91:05 pm
STL
-
CUN
1 stop7h 55m
Multiple Airlines
Sat 5/165:07 pm
CUN
-
STL
1 stop7h 14m
Multiple Airlines
Deal found 4/30$361
This Kiwi.com deal was found by Cheapflights users on 5/3. 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 8/138:08 pm
STL
-
CUN
1 stop16h 41m
Frontier
Tue 8/253:35 pm
CUN
-
STL
1 stop27h 48m
Frontier
Deal found 5/3$362
This Expedia deal was found by Cheapflights users on 5/3. 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.
Sat 6/68:08 pm
STL
-
CUN
1 stop15h 56m
Frontier
Wed 6/103:35 pm
CUN
-
STL
1 stop27h 18m
Frontier
Deal found 5/3$368
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 6/108:08 pm
STL
-
CUN
1 stop16h 40m
Frontier
Wed 6/1711:02 am
CUN
-
STL
1 stop7h 16m
Frontier
Deal found 4/30$372

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 May 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$337
(Expedia)

One-way from

$148
(Priceline)

Popular in

June

Cheapest in

September

Average price

$548

Good round-trip deal

$462 or less

Good one-way deal

$243 or less
Provider with most accurate pricing for Lambert-St Louis-Cancun flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Cancun flights.
Search Deals
From Lambert-St Louis to Cancun
Search Deals
One-way flight from Lambert-St Louis to Cancun
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Cancun.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Cancun.
Search Deals

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 May 4, 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

Price

Cheapest round-trip

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Wed 8/12

7:00 am-7:27 pm

2 stops12h 27m

Cancun

Tue 8/18

11:34 am-11:58 pm

2 stops12h 24m

$488

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sun 8/16

8:45 pm-12:40 pm

2 stops15h 55m

Cancun

Fri 8/21

1:40 pm-9:50 pm

1 stop8h 10m

$533

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Wed 10/14

6:15 am-12:02 pm

1 stop5h 47m

Cancun

Wed 10/21

3:43 pm-11:45 pm

1 stop8h 02m

$568

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sun 7/5

6:00 am-3:45 pm

2 stops9h 45m

Cancun

Thu 7/9

11:40 am-8:50 pm

2 stops9h 10m

$583

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Thu 9/17

6:14 am-12:02 pm

1 stop5h 48m

Cancun

Tue 9/22

1:43 pm-10:16 pm

1 stop8h 33m

$593

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Fri 6/26

6:30 am-1:05 pm

1 stop6h 35m

Cancun

Fri 7/3

11:19 am-11:56 pm

2 stops12h 37m

$594

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Thu 6/25

7:08 am-8:25 pm

1 stop13h 17m

Cancun

Thu 7/2

12:20 pm-11:56 pm

2 stops11h 36m

$594
Quickest round-trip

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Wed 10/14

8:35 am-2:20 pm

1 stop5h 45m

Cancun

Wed 10/21

1:45 pm-4:50 pm

Nonstop3h 05m

$597
Cheapest one-way

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Wed 8/19

8:08 pm-12:08 pm

1 stop16h 00m

$181

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Mon 7/27

10:51 am-8:15 pm

1 stop9h 24m

$190

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/3

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
Super.comPrice Accuracy-Trust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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?

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, 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 $568). 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 May 4, 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.

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

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
Our travel experts
Taryn White

Taryn White

Expert on STL

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

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

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 May 4, 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.
Southwest
7.9
Good
4,307 reviews

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
7.9
Good
4,307 reviews
Southwest
7.9
Good
4,307 reviews

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,680 reviews
Southwest
7.9
Good
4,307 reviews

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,673 reviews
Southwest
7.9
Good
4,307 reviews

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Volaris
6.6
Okay
1,166 reviews
Southwest
7.9
Good
4,307 reviews

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.6
Fair
2,966 reviews
Southwest
7.9
Good
4,307 reviews

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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.

  • What airports do I use to fly from St. Louis to Cancún?

    Booking a flight from Lambert-St Louis (STL) to Cancun (CUN) is your only option if you wish to fly from St. Louis to Cancún. On a typical day, there are 2 flights from Lambert-St Louis to Cancun, all of which are around 3h 05m for a nonstop flight. You can also purchase a plane ticket from 8 airlines when you book a flight from Lambert-St Louis to Cancún.

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

    Within the past month, 41 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 5h 47m. Delta provides one of the quickest options available for as low as $568. There are 1241 mi between St. Louis and Cancún. This flight may include one or multiple stops.

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

    Our cheapest airline available from St. Louis to Cancún is Aeromexico. Our recent data shows that you can find tickets from as low as $168 on this airline. Additional options worth looking into are Volaris and Delta, starting at $182 and $199 round-trip. Aeromexico is 63% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from St. Louis to Cancún one-way?

    One-way options have recently been found by users for as low as $119 on Frontier. Other airlines that offer cheap prices include United Airlines from $173 and Volaris from $174 one-way.

  • What are the most reliable airlines from St. Louis to Cancún?

    No one likes to see their flight delayed. When booking a flight from St. Louis to Cancún consider choosing Frontier (85%), Volaris (85%) or Southwest (57%) as they are the most reliable in getting you off to your destination on time.

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

    Looking at all options, your cheapest flight can be booked for $224. While the most popular route (Lambert-St Louis - Cancun) can be booked for $371 on average, our data indicates $408 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, 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 $568). 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
Punta Sam
Holbox

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for St. Louis to Cancún

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Cancún flights
Kansas City to Cozumel flights
St. Louis to Cozumel flights
Springfield to Cancún flights
Columbia to Cancún flights
Joplin to Cozumel flights

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 May 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
AeromexicoCheapest$168Average$480FlexibilityNo cancel feeOn-timeN/A
VolarisCheapest$182Average$375FlexibilityNo cancel feeOn-time79%
DeltaCheapest$199Average$501FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$219Average$410FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$330Average$551FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$404Average$468FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$423Average$630FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$471Average$632FlexibilityNo cancel feeOn-time63%

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