West Yellowstone, MT

What the Data Says About WYS

West Yellowstone, MT in West Yellowstone, Montana handled 3,872 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 87.9% on-time departure rate. Of those flights, 469 experienced delays, 16 were cancelled, and 19 were diverted. The cancellation rate works out to 0.41%, the diversion rate to 0.49%, and the average delay when departures run late is 109.7 minutes. These figures are the baseline for comparing WYS against other airports in the same state and nationally.

Breaking down what drives delays at WYS, Carrier leads the pack. Carrier accounts for 55.4% of total delay minutes, followed by Weather at 22.9% and Late Aircraft at 10.9%. Weather contributes 22.9% 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, October runs the cleanest at WYS with a 97.4% on-time rate, while July is the roughest at 92.4% — a 5-point swing between best and worst month. Volume peaks in July, when average flights hit 151. The busiest route from WYS is to WYS (West Yellowstone), with 1,229 flights at a 89.7% on-time rate. Combine these numbers — 87.9% on-time, 109.7-minute average delay, 0.41% cancellation rate — and you have a concrete picture of departure reliability at West Yellowstone, MT.