Cheap flight from St. Louis to Denver from $51
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Flights from St. Louis to Denver
Cheap flight deals from St. Louis to Denver
We've found these cheap flights for you. You can book one-way or round-trip flight tickets.
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Round-trip
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One way
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Cheapest nonstop
STL 4:07 PM2h 34mNonstopDEN 5:41 PMSt. Louis - Denver | Thu, May 15 | Frontier Airlines
DEN 6:00 AM2h 9mNonstopSTL 9:09 AMDenver - St. Louis | Fri, May 16 | Frontier Airlines$74 $15753% OFF53% OFF$157 $74 -
STL 7:55 PM2h 32mNonstopDEN 9:27 PMSt. Louis - Denver | Wed, May 28 | Frontier Airlines
DEN 7:00 AM2h 8mNonstopSTL 10:08 AMDenver - St. Louis | Wed, Jun 4 | Frontier Airlines$89 $15744% OFF44% OFF$157 $89
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STL 7:55 PM2h 32mNonstopDEN 9:27 PMSt. Louis - Denver | Sat, May 31 | Frontier Airlines
DEN 6:00 AM2h 12mNonstopSTL 9:12 AMDenver - St. Louis | Mon, Jun 2 | Frontier Airlines$95 $15740% OFF40% OFF$157 $95
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STL 7:24 PM2h 27mNonstopDEN 8:51 PMSt. Louis - Denver | Fri, Jun 6 | Frontier Airlines
DEN 6:00 AM2h 12mNonstopSTL 9:12 AMDenver - St. Louis | Mon, Jun 9 | Frontier Airlines$11030% OFF$157 $110
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STL 8:15 PM2h 33mNonstopDEN 9:48 PMSt. Louis - Denver | Sat, May 17 | Frontier Airlines
DEN 6:00 AM2h 9mNonstopSTL 9:09 AMDenver - St. Louis | Mon, May 19 | Frontier Airlines$11825% OFF$157 $118
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STL 8:15 PM2h 33mNonstopDEN 9:48 PMSt. Louis - Denver | Sat, May 10 | Frontier Airlines
DEN 6:00 AM2h 9mNonstopSTL 9:09 AMDenver - St. Louis | Mon, May 12 | Frontier Airlines$11924% OFF$157 $119
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STL 8:11 PM2h 30mNonstopDEN 9:41 PMSt. Louis - Denver | Wed, Jun 11 | Frontier Airlines
DEN 6:00 AM2h 12mNonstopSTL 9:12 AMDenver - St. Louis | Wed, Jun 18 | Frontier Airlines$11924% OFF$157 $119
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STL 7:55 PM2h 32mNonstopDEN 9:27 PMSt. Louis - Denver | Sat, May 24 | Frontier Airlines
DEN 7:00 AM2h 9mNonstopSTL 10:09 AMDenver - St. Louis | Wed, May 28 | Frontier Airlines$12024% OFF$157 $120
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STL 6:53 PM2h 29mNonstopDEN 8:22 PMSt. Louis - Denver | Wed, May 14 | Frontier Airlines
DEN 6:00 AM2h 9mNonstopSTL 9:09 AMDenver - St. Louis | Sat, May 17 | Frontier Airlines$12123% OFF$157 $121
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STL 7:29 PM2h 27mNonstopDEN 8:56 PMSt. Louis - Denver | Mon, Jun 16 | Frontier Airlines
DEN 6:00 AM2h 12mNonstopSTL 9:12 AMDenver - St. Louis | Wed, Jun 18 | Frontier Airlines$12123% OFF$157 $121
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STL 1:00 PM17h 25m1 stopsDEN Invalid DateSt. Louis - Denver | Mon, May 12 | Normal Airline
DEN 3:00 PM6hNonstopSTL 4:00 PMDenver - St. Louis | Wed, May 14 | Normal AirlineFind More FlightsFind More Flights
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Cheapest nonstop
STL 8:11 PM2h 30mNonstopDEN 9:41 PMSt. Louis - Denver | Sat, Jun 7 | Frontier Airlines$51 $17671% OFF71% OFF$176 $51
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STL 8:11 PM2h 30mNonstopDEN 9:41 PMSt. Louis - Denver | Wed, Jun 4 | Frontier Airlines$52 $17671% OFF71% OFF$176 $52
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STL 7:29 PM2h 27mNonstopDEN 8:56 PMSt. Louis - Denver | Wed, Jun 25 | Frontier Airlines$71 $17660% OFF60% OFF$176 $71
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STL 8:11 PM2h 30mNonstopDEN 9:41 PMSt. Louis - Denver | Wed, Jun 11 | Frontier Airlines$7160% OFF$176 $71
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STL 7:24 PM2h 27mNonstopDEN 8:51 PMSt. Louis - Denver | Mon, Jun 30 | Frontier Airlines$7259% OFF$176 $72
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STL 7:24 PM2h 27mNonstopDEN 8:51 PMSt. Louis - Denver | Fri, Jun 6 | Frontier Airlines$7359% OFF$176 $73
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STL 7:55 PM2h 32mNonstopDEN 9:27 PMSt. Louis - Denver | Sat, May 31 | Frontier Airlines$12827% OFF$176 $128
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STL 8:15 PM2h 33mNonstopDEN 9:48 PMSt. Louis - Denver | Sat, May 17 | Frontier Airlines$13225% OFF$176 $132
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STL 6:53 PM2h 29mNonstopDEN 8:22 PMSt. Louis - Denver | Wed, May 14 | Frontier Airlines$13225% OFF$176 $132
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STL 8:15 PM2h 33mNonstopDEN 9:48 PMSt. Louis - Denver | Sat, May 10 | Frontier Airlines$13623% OFF$176 $136
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STL 1:00 PM17h 25m1 stopsDEN Invalid DateSt. Louis - Denver | Mon, May 12 | Normal AirlineFind More FlightsFind More Flights
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Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
When is the cheapest time to fly from St. Louis to Denver?
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Frequently Asked Questions
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When are flight tickets from St. Louis (STL) to Denver (DEN) the cheapest?
Airlines adjust prices for flights from St. Louis to Denver based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays. -
How much do flights from St. Louis (STL) to Denver (DEN) cost?
According to Trip.com's data, the lowest price is around $369. -
How long does it take to fly from St. Louis (STL) to Denver (DEN) and what is the distance?
It takes around 2 hours 59 minutes to fly from St. Louis (STL) to Denver (DEN). -
What are the most popular airlines that fly from St. Louis (STL) to Denver (DEN)?
Airlines with flights from St. Louis (STL) to Denver (DEN): United Airlines, Southwest Airlines and Frontier Airlines.
How to find a cheap flight from St. Louis to Denver
Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to Denver. Book your flights at the right time and save more.
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Check One-way Fares
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Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
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Flight Info | St. Louis to Denver
| Cheapest one-way flight price | $50 |
|---|---|
| Cheapest round-trip ticket price | $73 |
| Off-season for travel | March |
| Peak season for travel | June |
| Flight distance | 1,253.6 km |
| Average flight time | 2 hours 59 minutes |
| Popular airline | American Airlines |