Great Falls, MT

What the Data Says About GTF

Great Falls, MT in Great Falls, Montana handled 29,395 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 88.3% on-time departure rate. Of those flights, 3,436 experienced delays, 176 were cancelled, and 35 were diverted. The cancellation rate works out to 0.60%, the diversion rate to 0.12%, and the average delay when departures run late is 88.5 minutes. These figures are the baseline for comparing GTF against other airports in the same state and nationally.

Breaking down what drives delays at GTF, Carrier leads the pack. Carrier accounts for 48.2% of total delay minutes, followed by Late Aircraft at 20.8% and Weather at 17.1%. Weather contributes 17.1% of delay minutes at this airport, while security holds the smallest share at 0.0%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.

Seasonally, March runs the cleanest at GTF with a 95.8% on-time rate, while February is the roughest at 93.2% — a 3-point swing between best and worst month. Volume peaks in August, when average flights hit 451. The busiest route from GTF is to SLC (Salt Lake City), with 5,902 flights at a 91.9% on-time rate. Combine these numbers — 88.3% on-time, 88.5-minute average delay, 0.60% cancellation rate — and you have a concrete picture of departure reliability at Great Falls, MT.