Waterloo, IA

What the Data Says About ALO

Waterloo, IA in Waterloo, Iowa handled 4,350 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 87.7% on-time departure rate. Of those flights, 535 experienced delays, 79 were cancelled, and 1 were diverted. The cancellation rate works out to 1.82%, the diversion rate to 0.02%, and the average delay when departures run late is 77.3 minutes. These figures are the baseline for comparing ALO against other airports in the same state and nationally.

Breaking down what drives delays at ALO, Late Aircraft leads the pack. Late Aircraft accounts for 34.6% of total delay minutes, followed by NAS (National Aviation System) at 26.0% and Carrier at 21.4%. Weather contributes 18.0% 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 ALO with a 98.4% on-time rate, while June is the roughest at 90.4% — a 8-point swing between best and worst month. Volume peaks in July, when average flights hit 118. The busiest route from ALO is to ALO (Waterloo), with 1,988 flights at a 86.3% on-time rate. Combine these numbers — 87.7% on-time, 77.3-minute average delay, 1.82% cancellation rate — and you have a concrete picture of departure reliability at Waterloo, IA.