The cheapest times to fly from STL to DEN are
- January 1st to March 4th (except the week of February 12th)
- July 30th to November 18th
based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from STL to DEN is early September. Prices can be as high as $567 for Sunday flights during late June, or as low as $119 for Tuesday flights around early September.
When to Fly to Denver
Flying from St. Louis, MO (STL) to Denver, CO (DEN) will usually cost between $134 to $431 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early September with an average ticket price of $155. Due to high demand the most expensive time to fly is late June, with an average price of $398. Planning your trip to low-cost times can easily save you $244 on economy flights and even more on first-class flights. Generally, any price below $248 can be considered a good price for a round-trip STL to DEN flight.
See below for a graph of average weekly prices for the STL to DEN route. All prices are for round-trip tickets in USD.
Compared to other flights, the STL to DEN flight is much cheaper than the average and costs much less than the average flight leaving from St. Louis. The average price per mile (for a direct flight) is $0.2, which is below average.
Flight Prices by Day of the Week
Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $84 (28%) on this flight.
Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $214. Return trip prices are from the DEN to STL flight, and often highlight the quality of our data in showing the same trend.
Departing Prices by Day
Return Trip Prices by Day
Nonstop Flights and Layovers
Travelers looking to fly from STL to DEN can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 2 hour 22 minutes may be realistic.
Flight Questions Answered
Still have questions about flying from STL to DEN? We’ve got answers.
Which airlines fly this route?
You can find 10 major airlines flying this route most often: Alaska, American, Cape Air, Delta, Frontier, Qantas, Singapore Airlines, Southwest, Sun Country Airlines, United, and potentially more during busy seasons.
How far away is it from Denver International Airport to St Louis Lambert International Airport?
The distance between the two airports is roughly 768 miles or 1236 kilometers.
How long does it take to fly from STL to DEN?
The real-world flight time for a nonstop STL to DEN flight is about 2 hour 22 minutes.
How many flights go between St. Louis, MO and Denver, CO?
It depends on the day of the week and the date, but a typical day might have around 82 available flights from STL to DEN.
Airport Location Info
|Origination airport name||St Louis Lambert International Airport|
|City||St. Louis, MO|
|Country||the United States|
|Destination airport name||Denver International Airport|
|Country||the United States|
Late and Early Flight Data
Flights from STL to DEN tend to depart much later than the average flight. According to our recently updated data, 45% of flights departed 5 or more minutes late, and 9% of flights left 5 or more minutes early. On average you can expect to leave DEN heading for STL about 24 minutes late. This does significantly impact arrival time, as the average landing time in Denver, CO is about 21 minutes late. The numbers below show a recent average of take-off times versus the scheduled departure flight:
- Southwest: 19 minutes late
- SkyWest: 86 minutes late
- United: 36 minutes late
- Republic: 10 minutes early
- Frontier: 11 minutes late
- Some airlines not reporting
Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.