$155 Cheap Flights from St. Louis (STL) to Cancun (CUN)

View $155 flight on Wed, Jul 15, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Cancun Intl. Airport (CUN)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

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

Prices were available within the past 7 days and start at $155 for one-way flights and $279 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Funjet Vacations
Tue, Jun 30 - Fri, Jul 3
STL
St. Louis
CUN
Cancun
$279 Roundtrip, found 14 hours ago
$279
Roundtrip
found 14 hours ago
Select Funjet Vacations flight, departing Tue, Jun 30 from St. Louis to Cancun, returning Fri, Jul 3, priced at $279 found 14 hours ago
Frontier Airlines
Sun, Jul 12 - Tue, Jul 28
STL
St. Louis
CUN
Cancun
$331 Roundtrip, found 3 days ago
$331
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sun, Jul 12 from St. Louis to Cancun, returning Tue, Jul 28, priced at $331 found 3 days ago
Delta
Sun, Jul 26 - Tue, Jul 28
STL
St. Louis
CUN
Cancun
$333 Roundtrip, found 1 day ago
$333
Roundtrip
found 1 day ago
Select Delta flight, departing Sun, Jul 26 from St. Louis to Cancun, returning Tue, Jul 28, priced at $333 found 1 day ago
Delta
Mon, Jul 13 - Thu, Jul 23
STL
St. Louis
CUN
Cancun
$342 Roundtrip, found 1 day ago
$342
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, Jul 13 from St. Louis to Cancun, returning Thu, Jul 23, priced at $342 found 1 day ago
Frontier Airlines
Mon, Jul 27 - Tue, Aug 4
STL
St. Louis
CUN
Cancun
$352 Roundtrip, found 1 day ago
$352
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Mon, Jul 27 from St. Louis to Cancun, returning Tue, Aug 4, priced at $352 found 1 day ago
Frontier Airlines
Wed, Jul 15 - Wed, Jul 22
STL
St. Louis
CUN
Cancun
$354 Roundtrip, found 1 day ago
$354
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Jul 15 from St. Louis to Cancun, returning Wed, Jul 22, priced at $354 found 1 day ago
Frontier Airlines
Tue, Jul 7 - Tue, Jul 21
STL
St. Louis
CUN
Cancun
$356 Roundtrip, found 2 days ago
$356
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Tue, Jul 7 from St. Louis to Cancun, returning Tue, Jul 21, priced at $356 found 2 days ago
Frontier Airlines
Tue, Jul 21 - Thu, Jul 30
STL
St. Louis
CUN
Cancun
$357 Roundtrip, found 1 day ago
$357
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, Jul 21 from St. Louis to Cancun, returning Thu, Jul 30, priced at $357 found 1 day ago
Southwest Airlines
Tue, Jul 7 - Wed, Jul 15
STL
St. Louis
CUN
Cancun
$368 Roundtrip, found 1 day ago
$368
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Tue, Jul 7 from St. Louis to Cancun, returning Wed, Jul 15, priced at $368 found 1 day ago
United
Sun, Jul 19 - Tue, Jul 28
STL
St. Louis
CUN
Cancun
$378 Roundtrip, found 1 day ago
$378
Roundtrip
found 1 day ago
Select United flight, departing Sun, Jul 19 from St. Louis to Cancun, returning Tue, Jul 28, priced at $378 found 1 day ago

Alternative airports near Cancun

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Cancun Intl. CUN. Cheapest and Closest option available. Average driving time to city center is 18 minutes. Flights from $444
CUN
Cancun Intl.
CheapestClosest
Average driving time to city center18 min
Flights from $444

Frequently asked questions

How much does a flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) cost?
You can find cheap one-way flights from $155 and cheap return flights from $279 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) with Expedia. One-way flights usually range from $189 to $971, and return flights typically cost between $454 and $1818. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
September is the cheapest month to fly from St. Louis to Cancun, with average round-trip fares around $488. This price is about 10% lower than the average throughout the year, as travel demand tends to decrease after the summer. Other affordable months to consider for flights from St. Louis to Cancun include January and October.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
Choose from 2 airlines operating direct flights from STL to CUN:

  • Frontier Airlines operates around 7 direct flights from STL to CUN every week
  • American Airlines operates around 7 direct flights from STL to CUN every week

What is the cheapest airline that flies from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
Spirit Airlines is one of the cheapest airlines offering connecting flights from Lambert-St. Louis Intl. (STL) to Cancun Intl. (CUN), with round-trip tickets starting from around $353. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
To find a cheap flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
The best airline to fly with from St. Louis, MO (STL) to Cancun, Quintana Roo (CUN) will differ from traveler to traveler. If you like to fly early, Frontier Airlines offers early morning flights. If price is the most important factor, Frontier Airlines typically offers the lowest fares. Delta offers the most daily flights from STL to CUN, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
When flying from St. Louis to Cancun, the best months are September and January. You can find return flights for about $488 in September, making it a budget-friendly option. January is also popular, providing a great escape from winter with warm weather in Cancun.*Prices based on flights available on Expedia in the last year.
How many flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
On average, there are around 2 nonstop flights per day from Lambert-St. Louis Intl. (STL) to Cancun Intl. (CUN). For more options, look at flights that include layovers.
What is the earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
The earliest flight from Lambert-St. Louis International Airport (STL) to Cancun International Airport (CUN) usually departs at around 5:00 AM, operated by American Airlines. This seasonal service is available in January, November, and December, allowing you to kick off your vacation in Cancun bright and early. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
The most popular departure times for flights from St. Louis, MO (STL) to Cancun (CUN) are in the early morning, from 6am to 9am. This accounts for around 55% of total traffic. Many major carriers, including American Airlines, Delta Airlines, and United Airlines, offer flights during this window. This timing is popular because it allows you to arrive in Cancun with a full day ahead of you.
How long does it take to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
A nonstop flight from STL to CUN typically takes around 3 hours 20 minutes, covering approximately 1,241 miles. Connecting flights on this route usually add 3 hours 10 minutes to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
Business class is available on flights from STL to CUN. Airlines that offer business class service on this route include:

  • Delta Air Lines
  • Air Canada
  • American Airlines
  • United Airlines

How do I earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) flight with Expedia?
It's easy to earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Cancun from Lambert-St. Louis Intl. (STL)?
From Lambert-St. Louis Intl. (STL), you can fly into Cancun Intl. (CUN) to reach Cancun. Some flights may connect through major hubs like Seattle - Tacoma Intl. (SEA), O'Hare Intl. (ORD), Denver Intl. (DEN) before reaching Cancun. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) at the last minute?
Typically, booking a last minute flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) flight and hotel package?
Securing a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) Quintana Roo Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.)?
If you booked your St. Louis, MO (STL-Lambert-St. Louis Intl.) to Cancun, Quintana Roo (CUN-Cancun Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Cancun Intl.
Airlines serving
Aeromexico, Air Canada, Alaska Airlines, American Airlines, Delta, Frontier Airlines, Funjet Vacations, Southwest Airlines, United
Roundtrip price
$279
Distance
1240 mi
Average flight time
3 hours 5 mins

Book with confidence

St. Louis to Cancun Flights

The cheapest times to fly from St. Louis to Cancun

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

 

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

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

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 St. Louis to Cancun in 2026. You can also book with separate airlines for your outbound and return journeys, from $155 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 St. Louis to Cancun 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 St. Louis to Cancun 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.

 

St. Louis to Cancun Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

Explore a world of travel with Expedia