Butte, MT

What the Data Says About BTM

Butte, MT in Butte, Montana handled 8,024 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 91% on-time departure rate. Of those flights, 719 experienced delays, 42 were cancelled, and 3 were diverted. The cancellation rate works out to 0.52%, the diversion rate to 0.04%, and the average delay when departures run late is 102.0 minutes. These figures are the baseline for comparing BTM against other airports in the same state and nationally.

Breaking down what drives delays at BTM, Carrier leads the pack. Carrier accounts for 65.1% of total delay minutes, followed by Weather at 25.2% and NAS (National Aviation System) at 5.0%. Weather contributes 25.2% of delay minutes at this airport, while security holds the smallest share at 0.3%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.

Seasonally, November runs the cleanest at BTM with a 98.2% on-time rate, while January is the roughest at 94.8% — a 3-point swing between best and worst month. Volume peaks in October, when average flights hit 116. The busiest route from BTM is to SLC (Salt Lake City), with 3,311 flights at a 91.9% on-time rate. Combine these numbers — 91% on-time, 102.0-minute average delay, 0.52% cancellation rate — and you have a concrete picture of departure reliability at Butte, MT.