Guam, TT

What the Data Says About GUM

Guam, TT in Guam, U.S. Pacific Trust Territories and Possessions handled 8,429 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 90.6% on-time departure rate. Of those flights, 796 experienced delays, 40 were cancelled, and 2 were diverted. The cancellation rate works out to 0.47%, the diversion rate to 0.02%, and the average delay when departures run late is 74.8 minutes. These figures are the baseline for comparing GUM against other airports in the same state and nationally.

Breaking down what drives delays at GUM, Carrier leads the pack. Carrier accounts for 59.9% of total delay minutes, followed by Late Aircraft at 29.9% and NAS (National Aviation System) at 10.0%. Weather contributes 0.2% 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, March runs the cleanest at GUM with a 97.3% on-time rate, while June is the roughest at 94.1% — a 3-point swing between best and worst month. Volume peaks in August, when average flights hit 123. The busiest route from GUM is to HNL (Honolulu), with 2,023 flights at a 90.9% on-time rate. Combine these numbers — 90.6% on-time, 74.8-minute average delay, 0.47% cancellation rate — and you have a concrete picture of departure reliability at Guam, TT.