Cheyenne, WY

What the Data Says About CYS

Cheyenne, WY in Cheyenne, Wyoming handled 5,577 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 85.4% on-time departure rate. Of those flights, 815 experienced delays, 76 were cancelled, and 2 were diverted. The cancellation rate works out to 1.36%, the diversion rate to 0.04%, and the average delay when departures run late is 138.2 minutes. These figures are the baseline for comparing CYS against other airports in the same state and nationally.

Breaking down what drives delays at CYS, Carrier leads the pack. Carrier accounts for 44.0% of total delay minutes, followed by Late Aircraft at 23.6% and Weather at 16.4%. Weather contributes 16.4% 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, September runs the cleanest at CYS with a 95.8% on-time rate, while July is the roughest at 90.6% — a 5-point swing between best and worst month. Volume peaks in July, when average flights hit 128. The busiest route from CYS is to CYS (Cheyenne), with 2,594 flights at a 82.7% on-time rate. Combine these numbers — 85.4% on-time, 138.2-minute average delay, 1.36% cancellation rate — and you have a concrete picture of departure reliability at Cheyenne, WY.