San Antonio, TX

What the Data Says About SAT

San Antonio, TX in San Antonio, Texas handled 419,736 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 81.7% on-time departure rate. Of those flights, 76,925 experienced delays, 4,599 were cancelled, and 417 were diverted. The cancellation rate works out to 1.10%, the diversion rate to 0.10%, and the average delay when departures run late is 71.5 minutes. These figures are the baseline for comparing SAT against other airports in the same state and nationally.

Breaking down what drives delays at SAT, Late Aircraft leads the pack. Late Aircraft accounts for 44.1% of total delay minutes, followed by Carrier at 32.9% and NAS (National Aviation System) at 18.3%. Weather contributes 4.6% 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 SAT with a 93.6% on-time rate, while June is the roughest at 89.5% — a 4-point swing between best and worst month. Volume peaks in October, when average flights hit 6,180. The busiest route from SAT is to DFW (Dallas/Fort Worth), with 22,003 flights at a 78.9% on-time rate. Combine these numbers — 81.7% on-time, 71.5-minute average delay, 1.10% cancellation rate — and you have a concrete picture of departure reliability at San Antonio, TX.