Louisville to Denver

What the Data Says About SDF to DEN

The Louisville to Denver corridor (SDF → DEN) covers roughly 1,024 miles and is served by 20 carriers, based on Bureau of Transportation Statistics reporting. Across 5,950 flights in the dataset, this route posts a 83.6% on-time rate with an average delay of 74.8 minutes when flights run late. Over the most recent 24 months of BTS data, 2,153 flights were recorded on this pairing — 15 cancelled (0.7%) and 6 diverted (0.3%). Those baseline metrics tell you what to expect before you book.

Having 20 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 5,950 total flights analyzed, the 83.6% on-time figure is statistically meaningful rather than a small-sample fluke. The 74.8-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, Dec 2024 posted the best performance on this corridor at 95% on-time, while Jan 2025 came in at 67% on-time — a 28-point gap between best and worst recent month. For travelers evaluating the SDF to DEN route, the combination of a 83.6% on-time rate, 74.8-minute average delay, 0.7% recent cancellation rate, and 20 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.