Gustavus, AK

What the Data Says About GST

Gustavus, AK in Gustavus, Alaska handled 1,064 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 90.3% on-time departure rate. Of those flights, 103 experienced delays, 21 were cancelled, and 0 were diverted. The cancellation rate works out to 1.97%, the diversion rate to 0.00%, and the average delay when departures run late is 63.1 minutes. These figures are the baseline for comparing GST against other airports in the same state and nationally.

Breaking down what drives delays at GST, Late Aircraft leads the pack. Late Aircraft accounts for 63.5% of total delay minutes, followed by Carrier at 14.6% and NAS (National Aviation System) at 14.2%. Weather contributes 2.0% of delay minutes at this airport, while security holds the smallest share at 5.7%. 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 GST with a 100% on-time rate, while July is the roughest at 94.1% — a 6-point swing between best and worst month. Volume peaks in July, when average flights hit 62. Combine these numbers — 90.3% on-time, 63.1-minute average delay, 1.97% cancellation rate — and you have a concrete picture of departure reliability at Gustavus, AK.