Great Falls to Denver

What the Data Says About GTF to DEN

The Great Falls to Denver corridor (GTF → DEN) covers roughly 623 miles and is served by 4 carriers, based on Bureau of Transportation Statistics reporting. Across 4,495 flights in the dataset, this route posts a 83.1% on-time rate with an average delay of 101.3 minutes when flights run late. Over the most recent 24 months of BTS data, 1,460 flights were recorded on this pairing — 18 cancelled (1.2%) and 4 diverted (0.3%). Those baseline metrics tell you what to expect before you book.

Having 4 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 4,495 total flights analyzed, the 83.1% on-time figure is statistically meaningful rather than a small-sample fluke. The 101.3-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 71% on-time — a 24-point gap between best and worst recent month. For travelers evaluating the GTF to DEN route, the combination of a 83.1% on-time rate, 101.3-minute average delay, 1.2% recent cancellation rate, and 4 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.