Lewiston, ID

What the Data Says About LWS

Lewiston, ID in Lewiston, Idaho handled 10,808 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 89.7% on-time departure rate. Of those flights, 1,112 experienced delays, 39 were cancelled, and 27 were diverted. The cancellation rate works out to 0.36%, the diversion rate to 0.25%, and the average delay when departures run late is 101.2 minutes. These figures are the baseline for comparing LWS against other airports in the same state and nationally.

Breaking down what drives delays at LWS, Carrier leads the pack. Carrier accounts for 66.1% of total delay minutes, followed by Weather at 20.3% and Late Aircraft at 10.0%. Weather contributes 20.3% of delay minutes at this airport, while security holds the smallest share at 0.2%. 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 LWS with a 97% on-time rate, while December is the roughest at 93.4% — a 4-point swing between best and worst month. Volume peaks in August, when average flights hit 163. The busiest route from LWS is to SLC (Salt Lake City), with 3,268 flights at a 90.9% on-time rate. Combine these numbers — 89.7% on-time, 101.2-minute average delay, 0.36% cancellation rate — and you have a concrete picture of departure reliability at Lewiston, ID.