Walla Walla, WA

What the Data Says About ALW

Walla Walla, WA in Walla Walla, Washington handled 4,519 flights in the Bureau of Transportation Statistics dataset between 2021 and 2024, posting a 88.8% on-time departure rate. Of those flights, 504 experienced delays, 76 were cancelled, and 2 were diverted. The cancellation rate works out to 1.68%, the diversion rate to 0.04%, and the average delay when departures run late is 62.1 minutes. These figures are the baseline for comparing ALW against other airports in the same state and nationally.

Breaking down what drives delays at ALW, Late Aircraft leads the pack. Late Aircraft accounts for 50.8% of total delay minutes, followed by Carrier at 24.5% and NAS (National Aviation System) at 14.1%. Weather contributes 10.6% 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, April runs the cleanest at ALW with a 97.8% on-time rate, while December is the roughest at 92.6% — a 5-point swing between best and worst month. Volume peaks in March, when average flights hit 124. The busiest route from ALW is to SEA (Seattle), with 2,217 flights at a 88.5% on-time rate. Combine these numbers — 88.8% on-time, 62.1-minute average delay, 1.68% cancellation rate — and you have a concrete picture of departure reliability at Walla Walla, WA.