Riverton/Lander, WY

What the Data Says About RIW

Riverton/Lander, WY in Riverton/Lander, Wyoming handled 6,519 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 85.6% on-time departure rate. Of those flights, 939 experienced delays, 96 were cancelled, and 16 were diverted. The cancellation rate works out to 1.47%, the diversion rate to 0.25%, and the average delay when departures run late is 126.2 minutes. These figures are the baseline for comparing RIW against other airports in the same state and nationally.

Breaking down what drives delays at RIW, Carrier leads the pack. Carrier accounts for 50.9% of total delay minutes, followed by Late Aircraft at 28.3% and Weather at 12.2%. Weather contributes 12.2% 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 RIW with a 95.9% on-time rate, while February is the roughest at 90.7% — a 5-point swing between best and worst month. Volume peaks in December, when average flights hit 101. The busiest route from RIW is to RIW (Riverton/Lander), with 3,019 flights at a 84.2% on-time rate. Combine these numbers — 85.6% on-time, 126.2-minute average delay, 1.47% cancellation rate — and you have a concrete picture of departure reliability at Riverton/Lander, WY.