Direct STL to DEN Flights: Your Guide to St. Louis to Denver Travel
Cheapest flight found
$95
Last updated Mar 13, 2026
Prices by Month
Price History
Tracking the Jun 4, 2026 departure — the cheapest date we found.
Price Behavior: STL → DEN
Based on 6 months of fare data collected by Trip Manta.
Lowest Fare
$95
Highest Fare
$219
Median Fare
$194
Price Spread
$124
Prices vary significantly — hourly tracking is especially valuable here.
Cheapest month to fly: June 2026 (from $95)
Most expensive month: July 2026 (from $219)
Biggest price drop caught: $42 between consecutive checks
Most frequent cheapest airline: Frontier
What This Means for You
Flights from St. Louis to Denver range from $95 to $219, a $124 spread across the months we track. If your dates are flexible, June 2026 tends to have the lowest fares. Because prices on this route change significantly, setting up hourly price alerts gives you the best chance of catching a short-lived drop before it corrects. We have caught drops as large as $42 between hourly checks on this route.
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From
St. Louis (STL)
To
Denver (DEN)
Airport Information
St. Louis (STL)
St. Louis Lambert International Airport (STL) serves as the primary aviation hub for the Greater St. Louis region and holds a prestigious place in aviation history as the site of Charles Lindbergh's early career. The airport features two main terminals: Terminal 1, which houses most legacy carriers, and Terminal 2, which is dedicated exclusively to Southwest Airlines. Travelers can enjoy local culinary staples like Missouri-style barbecue or toasted ravioli before their flight, and the facility is conveniently linked to the metropolitan area via the MetroLink light rail system.
Denver (DEN)
Denver International Airport (DEN) is famous worldwide for its iconic white peaked roof, designed to mimic the snow-capped summits of the Rocky Mountains. As one of the largest airports in the world by land area, it serves as a massive hub for United Airlines and Frontier Airlines, as well as a major base for Southwest. The airport is located about 25 miles northeast of downtown and offers a vast array of amenities, including high-end dining, an outdoor plaza for relaxation, and several intriguing art installations that are the subject of local lore.
Frequently Asked Questions
How long is the average flight from STL to DEN?
Non-stop flights from St. Louis to Denver typically have a flight duration of approximately 2 hours and 15 minutes, though tailwinds can sometimes shorten the eastbound return trip.
Which airlines offer non-stop service between St. Louis and Denver?
Southwest Airlines, United Airlines, and Frontier Airlines are the primary carriers offering consistent direct daily flights on this route.
Is there a time zone change when flying from St. Louis to Denver?
Yes, St. Louis is in the Central Time Zone, while Denver is in the Mountain Time Zone, so you will gain one hour when traveling west from STL to DEN.
How far is Denver International Airport from downtown Denver?
The airport is approximately 25 miles from the city center, and the drive usually takes 30 to 45 minutes depending on traffic conditions.
What is the best way to get from STL airport to downtown St. Louis?
The MetroLink light rail is the most cost-effective method, with stations located at both Terminal 1 and Terminal 2, providing direct access to downtown and the Clayton business district.
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Our Methodology
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