$223 Cheap Frontier Airlines flights Cancun (CUN) to St. Louis (STL)

View $223 flight on Tue, Sep 2, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

$223 Cheap Frontier Airlines flights Cancun (CUN) to St. Louis (STL)

Prices were available within the past 7 days and start at $223 for one-way flights and $345 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, Sep 12 - Sun, Sep 21
CUN
Cancun
STL
St. Louis
$345 Roundtrip, found 2 days ago
$345
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Fri, Sep 12 from Cancun to St. Louis, returning Sun, Sep 21, priced at $345 found 2 days ago
Frontier Airlines
Thu, Jul 10 - Fri, Jul 11
CUN
Cancun
STL
St. Louis
$366 Roundtrip, found 5 days ago
$366
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Thu, Jul 10 from Cancun to St. Louis, returning Fri, Jul 11, priced at $366 found 5 days ago
Frontier Airlines
Sun, Sep 7 - Sun, Sep 14
CUN
Cancun
STL
St. Louis
$374 Roundtrip, found 3 hours ago
$374
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sun, Sep 7 from Cancun to St. Louis, returning Sun, Sep 14, priced at $374 found 3 hours ago
Frontier Airlines
Sat, Oct 4 - Sun, Oct 5
CUN
Cancun
STL
St. Louis
$397 Roundtrip, found 3 days ago
$397
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sat, Oct 4 from Cancun to St. Louis, returning Sun, Oct 5, priced at $397 found 3 days ago
Frontier Airlines
Wed, Aug 20 - Sun, Aug 24
CUN
Cancun
STL
St. Louis
$401 Roundtrip, found 1 day ago
$401
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Aug 20 from Cancun to St. Louis, returning Sun, Aug 24, priced at $401 found 1 day ago
Frontier Airlines
Wed, Aug 20 - Sun, Aug 24
CUN
Cancun
STL
St. Louis
$405 Roundtrip, found 1 day ago
$405
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Aug 20 from Cancun to St. Louis, returning Sun, Aug 24, priced at $405 found 1 day ago
Flights from Cancun (CUN) to St. Louis (STL)
Origin airport
Cancun Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Aeromexico, Air Canada, Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Spirit Airlines, United
Popular airline
Aeromexico
Distance
1240 mi
Average flight time
3 hours 16 mins

Frequently asked questions

How much is a Frontier Airlines flight from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
Make use of the "Price (lowest to highest)" filter on Expedia to find cheap Frontier Airlines return flights from $345 from CUN to STL. Affordable one-way tickets from $223 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from CUN to STL with Frontier Airlines?
Frontier Airlines flights to St. Louis are usually more affordable in the low-season months of January and February. Whether you're after a return or one-way ticket, you could find a better deal then.
What is the cheapest time to book flights from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL) with Frontier Airlines?
To find affordable flights from CUN to STL with Frontier Airlines, begin your search about one month before your planned departure. You can save 17% when you book your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another tip? Booking on Sunday can lead to average savings of 17% compared to Friday (the most expensive day).**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Frontier Airlines fly nonstop from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
Take off on one of Frontier Airlines's 7 direct weekly flights from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL). To view available options, enter your destination, origin and dates and hit search. Then use the "Nonstop" and "Airline" filters.
How long does it take to fly from CUN to STL with Frontier Airlines?
Leave Cancun Intl. Airport (CUN) for Lambert-St. Louis Intl. Airport (STL) on a direct Frontier Airlines flight, and you'll be airborne for about 3h 23m.
What is the earliest Frontier Airlines flight from CUN to STL?
Taking off from CUN at 12:21PM UTC-5, the first Frontier Airlines flight to STL arrives at 2:44PM UTC-6. Flying earlier in the day means you'll be less likely to experience cancellations.* Prefer a later start? The last Frontier Airlines flight from CUN to STL departs at 12:34PM UTC-5 and touches down at 2:57PM UTC-6.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Frontier Airlines fly into in St. Louis?
Lambert-St. Louis Intl. Airport (STL) is the main St. Louis gateway for Frontier Airlines flights from Cancun Intl. Airport (CUN).
Why fly with Frontier Airlines from CUN to STL?
A rewarding loyalty program and the ability to collect points through Frontier Miles are the start of the reasons to depart from CUN to STL with Frontier Airlines. Plus, when you sign up to Expedia's free One Key™ program, you can earn OneKeyCash™* on top of any airline loyalty program earnings. It's yours to spend on future travel plans.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does Frontier Airlines fly from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
You'll probably be on an Airbus A321neo for your Frontier Airlines flight from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL). However, you could be switched to an alternative aircraft if there are operational changes.
Can I change or cancel my Frontier Airlines flight from Cancun Intl. Airport (CUN) to Lambert-St. Louis Intl. Airport (STL)?
Changes are often free within 24 hours of making a booking, but your airline may charge a fee after that time. For further details about modifying your reservation, go to your "Trips," select your flight and click on "Manage Booking." If you want the flexibility to change your itinerary without being charged, tick the "No cancel fee" or "Changes included" filter when organizing your trip.

Explore a world of travel with Expedia

*Available to One Key members.