St. Louis Lambert International Airport
St. Louis, United StatesSTL / KSTL
Major airport · 88 direct destinations · 4 runways · longest runway 11,020 ft
53 °F · CloudySource: METAR observation via the NOAA Aviation Weather Center
Route
St. Louis → Denver
STL
St. LouisSt. Louis Lambert International Airport
St. LouisSt. Louis Lambert International AirportDENDenverDenver International Airport
DenverDenver International Airport- Distance
- 768 mi
- Estimated flight time
- ~2h 5m
Denver is currently 1 hour behind St. Louis.
Observed nonstop
How often does this route fly?
Frequency
Throughout the day
On average around 10 flights a day, observed from October 2025 to September 2026.
- 10
- flights per day
- 12
- busiest month · Jun
- 8
- quietest month · Dec
- 1 hr 57 min
- measured flight time
- 12 / 12
- months seen
Through the year
Per day, month by month
- 8Jan2026
- 8Feb
- 10Mar
- 9Apr
- 10May
- 12Jun
- 11Jul
- 10Aug
- 11Sep
- 10Oct2025
- 9Nov
- 8Dec
Airlines
Who flies it
Southwest Airlinesall year
United Airlinesall year
Frontier Airlinesall year
SkyWest Airlinesspring
Through the day
Departure times
Local time in St. Louis. Most departures between 18:00 and 21:00.
- 00:00
- 01:00
- 02:00
- 03:00
- 04:00
- 05:00
- 06:00
- 07:00
- 08:00
- 09:00
- 10:00
- 11:00
- 12:00
- 13:00
- 14:00
- 15:00
- 16:00
- 17:00
- 18:00
- 19:00
- 20:00
- 21:00
- 22:00
- 23:00
Through the week
By weekday
- 10Mon
- 9.4Tue
- 8.8Wed
- 9.5Thu
- 9.8Fri
- 9.3Sat
- 9.6Sun
Fleet
Aircraft observed
- Boeing 737-800B73833%
- Boeing 737 MAX 8B38M30%
- Boeing 737-700B73713%
- Airbus A319A3196%
- Airbus A320A3205%
All the numbers in a table
| Month | Per day | Seen | Airlines |
|---|---|---|---|
| January 2026 | 8 | 238 |
|
| February 2026 | 8 | 241 |
|
| March 2026 | 10 | 297 |
|
| April 2026 | 9 | 261 |
|
| May 2026 | 10 | 275 |
|
| June 2026 | 12 | 339 |
|
| July 2026 | 11 | 351 |
|
| August 2026 | 10 | 298 |
|
| September 2026 | 11 | 308 |
|
| October 2025 | 10 | 315 |
|
| November 2025 | 9 | 263 |
|
| December 2025 | 8 | 236 |
|
Airlines observed on this route
From observed callsign routes on STL-DEN - not a booking guarantee.
About this route
- Domestic route: both airports are in the same country.
- The opposite direction has also been observed as a direct connection.
- Direct destinations observed from St. Louis: 88.
- Direct destinations observed from Denver: 203.
The airports on this route
Denver International Airport
Denver, United StatesDEN / KDEN
International hub · 203 direct destinations · 6 runways · longest runway 16,001 ft
53 °F · ClearSource: METAR observation via the NOAA Aviation Weather Center
About the route from St. Louis to Denver
The observed direct connection between St. Louis Lambert International Airport (STL) and Denver International Airport (DEN) covers approximately 768 mi. The estimated flight time is around 2h 5m. Frontier Airlines, SkyWest Airlines, Southwest Airlines and United Airlines have been observed on this connection in the available route data.
Frequently asked questions about this route
- How far is St. Louis from Denver by air?
- The great-circle distance between St. Louis Lambert International Airport and Denver International Airport is approximately 768 mi.
- How long is the flight from St. Louis to Denver?
- Based on the distance, the estimated flight time is about 2h 5m. This is an estimate, not a schedule.
- Is there a direct connection from St. Louis to Denver?
- Yes, a direct connection between STL and DEN has been observed in our route data.
- Which airlines have been observed on this route?
- In the available route data: Frontier Airlines, SkyWest Airlines, Southwest Airlines and United Airlines.
- How often is there a flight from St. Louis to Denver?
- On average around 10 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 3,422 observed flights. Mainly Southwest Airlines, United Airlines, Frontier Airlines. That is an observation, not a timetable.
- What is the current time difference between St. Louis and Denver?
- Denver is currently 1 hour behind St. Louis.
Where this data comes from
The route data comes from the flight archive (ADS-B, adsb.lol): which connections actually flew over the last twelve full months and who flew them, combined with our own airport, runway, and airline datasets. It is reference data about observed routes - not a current timetable and no claim about bookability.
The frequency and aircraft on this page come from the flight archive (ADS-B, 12 months, October 2025 to September 2026), summarized per route per month. We do not see every flight, so it is a floor, not a count.
Route data updated on October 11, 2026.