Denver to St. Louis

What the Data Says About DEN to STL

The Denver to St. Louis corridor (DEN → STL) covers roughly 770 miles and is served by 27 carriers, based on Bureau of Transportation Statistics reporting. Across 20,926 flights in the dataset, this route posts a 77.9% on-time rate with an average delay of 62.1 minutes when flights run late. Over the most recent 24 months of BTS data, 7,511 flights were recorded on this pairing — 54 cancelled (0.7%) and 11 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 27 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 20,926 total flights analyzed, the 77.9% on-time figure is statistically meaningful rather than a small-sample fluke. The 62.1-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Oct 2024 posted the best performance on this corridor at 88% on-time, while Jul 2025 came in at 66% on-time — a 21-point gap between best and worst recent month. For travelers evaluating the DEN to STL route, the combination of a 77.9% on-time rate, 62.1-minute average delay, 0.7% recent cancellation rate, and 27 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.