Santa Rosa, CA

What the Data Says About STS

Santa Rosa, CA in Santa Rosa, California handled 43,075 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 83.3% on-time departure rate. Of those flights, 7,178 experienced delays, 344 were cancelled, and 50 were diverted. The cancellation rate works out to 0.80%, the diversion rate to 0.12%, and the average delay when departures run late is 70.1 minutes. These figures are the baseline for comparing STS against other airports in the same state and nationally.

Breaking down what drives delays at STS, Late Aircraft leads the pack. Late Aircraft accounts for 51.4% of total delay minutes, followed by Carrier at 26.3% and NAS (National Aviation System) at 13.3%. Weather contributes 8.8% of delay minutes at this airport, while security holds the smallest share at 0.2%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.

Seasonally, February runs the cleanest at STS with a 93.4% on-time rate, while December is the roughest at 88.1% — a 5-point swing between best and worst month. Volume peaks in September, when average flights hit 725. The busiest route from STS is to LAX (Los Angeles), with 3,457 flights at a 83.8% on-time rate. Combine these numbers — 83.3% on-time, 70.1-minute average delay, 0.80% cancellation rate — and you have a concrete picture of departure reliability at Santa Rosa, CA.