Billings, MT

What the Data Says About BIL

Billings, MT in Billings, Montana handled 51,010 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 85.7% on-time departure rate. Of those flights, 7,307 experienced delays, 370 were cancelled, and 73 were diverted. The cancellation rate works out to 0.73%, the diversion rate to 0.14%, and the average delay when departures run late is 78.5 minutes. These figures are the baseline for comparing BIL against other airports in the same state and nationally.

Breaking down what drives delays at BIL, Carrier leads the pack. Carrier accounts for 39.2% of total delay minutes, followed by Late Aircraft at 27.1% and NAS (National Aviation System) at 22.5%. Weather contributes 11.1% of delay minutes at this airport, while security holds the smallest share at 0.1%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.

Seasonally, September runs the cleanest at BIL with a 95.7% on-time rate, while December is the roughest at 92.4% — a 3-point swing between best and worst month. Volume peaks in August, when average flights hit 869. The busiest route from BIL is to DEN (Denver), with 7,478 flights at a 81.6% on-time rate. Combine these numbers — 85.7% on-time, 78.5-minute average delay, 0.73% cancellation rate — and you have a concrete picture of departure reliability at Billings, MT.