$34 Cheap Frontier Airlines flights from St. Louis to Denver (STL to DEN)
Find The Best Day To Fly from St. Louis to Denver
Amazing Frontier Airlines STL to DEN Flight Deals
The cheapest flights to Denver Intl. found within the past 7 days were $53 round trip and $34 one way. Prices and availability subject to change. Additional terms may apply.
DEN From STL Economy Coach Packages on Similar Airlines
Frequently asked questions
| Carrier | Flight | Depart STL | Arrive DEN | Wed 4/24 | Thu 4/25 | Fri 4/26 | Sat 4/27 | Sun 4/28 | Mon 4/29 | Tue 4/30 | Stops | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | F97 | 08:04 pm | 09:35 pm | Check Fare | - | Check Fare | Check Fare | - | Check Fare | - | 0 Stops | |
| F93301 | 11:38 am | 01:07 pm | - | Check Fare | - | - | Check Fare | - | Check Fare | 0 Stops | |
Discover our best Frontier Airlines flight from St. Louis STL to Denver DEN
To find the best deals on flights to St. Louis from Denver with Frontier Airlines, just enter your travel dates, filter by Frontier Airlines, and hit search. You’ll find 1 flights to choose from and can sort by price, flight duration, and arrival or departure time.
Return flights from St. Louis STL to Denver DEN with Frontier Airlines
If you’re planning a round trip, booking return flights with Frontier Airlines is usually the most cost-effective option. With airfares ranging from $53 to $62, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply.
Book one-way Frontier Airlines flights from St. Louis STL to Denver DEN
A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way Frontier Airlines flight from St. Louis to Denver costs from $34. Prices and availability subject to change. Additional terms may apply.
The easy way to find cheap flights to Denver DEN from St. Louis STL with Frontier Airlines
To find a cheap Frontier Airlines flight from St. Louis STL to Denver DEN, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference.
How to find our best airfare deals on Frontier Airlines flights from St. Louis STL to Denver DEN
If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as May, or if you book a flight with a stopover.
Find nonstop flights from St. Louis STL to Denver DEN with Frontier Airlines
If you’re keen to be on Denver soil fast, don’t waste time with a stopover—filter your search results to show direct Frontier Airlines flights only. The journey takes around 2 hour(s) 30 min(s) – so you’ll be there before you know it.
Flexible airline tickets for Frontier Airlines flights from St. Louis STL to Denver DEN
Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.
There are a lot of reasons to book your flights to Denver DEN from St. Louis STL with Frontier Airlines on Travelocity
At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.
Airport code | Country | Airport name | Number of flights |
|---|---|---|---|
| DEN | USA | Denver Intl. | 13 |
| MCO | USA | Orlando Intl. | 7 |
| CUN | MEX | Cancun Intl. | 6 |
| GDL | MEX | Don Miguel Hidalgo y Costilla Intl. | 5 |
| PHL | USA | Philadelphia Intl. | 2 |
| ORD | USA | O'Hare Intl. | 2 |
| MIA | USA | Miami Intl. | 1 |
| LAS | USA | McCarran Intl. | 1 |
| MEX | MEX | Mexico City Intl. | 1 |
| LAX | USA | Los Angeles Intl. | 1 |
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Popular Frontier Airlines Flight Routes from STL
- Frontier Airlines STL to PHL
- Frontier Airlines STL to SAN
- Frontier Airlines STL to LAX
- Frontier Airlines STL to PDX
- Frontier Airlines STL to MCO
- Frontier Airlines STL to SJU
- Frontier Airlines STL to DEN
- Frontier Airlines STL to CUN
- Frontier Airlines STL to IAH
- Frontier Airlines STL to LAS
- Frontier Airlines STL to PHX
- Frontier Airlines STL to SLC
Top Frontier Airlines Flight Routes from DEN
- Frontier Airlines DEN to ORD
- Frontier Airlines DEN to LGA
- Frontier Airlines DEN to MSP
- Frontier Airlines DEN to MCO
- Frontier Airlines DEN to LAS
- Frontier Airlines DEN to SFO
- Frontier Airlines DEN to TPA
- Frontier Airlines DEN to LAX
- Frontier Airlines DEN to ATL
- Frontier Airlines DEN to BOS
- Frontier Airlines DEN to SEA
Top Flights for Frontier Airlines originating from STL
Domestic
- Philadelphia to Orlando (PHL - MCO)
- Atlanta to Miami (ATL - MIA)
- Chicago to Orlando (ORD - MCO)
- Atlanta to New York (ATL - LGA)
- Los Angeles to San Francisco (LAX - SFO)
- San Francisco to New York (SFO - LGA)
- Atlanta to Las Vegas (ATL - LAS)
- San Francisco to Las Vegas (SFO - LAS)
- Atlanta to Las Vegas (ATL - LAS)
- San Francisco to Los Angeles (SFO - LAX)
International
- Chicago to Miami (ORD - MIA)
- San Francisco to Las Vegas (SFO - LAS)
- Dallas to Las Vegas (DFW - LAS)
- Philadelphia to Orlando (PHL - MCO)
- Atlanta to Miami (ATL - MIA)
- Boston to Orlando (BOS - MCO)
- New York to Las Vegas (LGA - LAS)
- San Francisco to New York (SFO - LGA)
- New York to Orlando (LGA - MCO)
- Chicago to Las Vegas (ORD - LAS)