Springfield, IL

What the Data Says About SPI

Springfield, IL in Springfield, Illinois handled 8,116 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 82.8% on-time departure rate. Of those flights, 1,398 experienced delays, 136 were cancelled, and 11 were diverted. The cancellation rate works out to 1.68%, the diversion rate to 0.14%, and the average delay when departures run late is 85.4 minutes. These figures are the baseline for comparing SPI against other airports in the same state and nationally.

Breaking down what drives delays at SPI, Carrier leads the pack. Carrier accounts for 40.0% of total delay minutes, followed by Late Aircraft at 25.3% and NAS (National Aviation System) at 22.2%. Weather contributes 12.3% of delay minutes at this airport, while security holds the smallest share at 0.1%. 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 SPI with a 93.3% on-time rate, while December is the roughest at 86.8% — a 7-point swing between best and worst month. Volume peaks in September, when average flights hit 142. The busiest route from SPI is to SPI (Springfield), with 2,078 flights at a 87.7% on-time rate. Combine these numbers — 82.8% on-time, 85.4-minute average delay, 1.68% cancellation rate — and you have a concrete picture of departure reliability at Springfield, IL.