Chicago to Boise

What the Data Says About ORD to BOI

The Chicago to Boise corridor (ORD → BOI) covers roughly 1,437 miles and is served by 21 carriers, based on Bureau of Transportation Statistics reporting. Across 5,089 flights in the dataset, this route posts a 81.1% on-time rate with an average delay of 64.3 minutes when flights run late. Over the most recent 24 months of BTS data, 1,550 flights were recorded on this pairing — 10 cancelled (0.6%) and 7 diverted (0.5%). Those baseline metrics tell you what to expect before you book.

Having 21 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 5,089 total flights analyzed, the 81.1% on-time figure is statistically meaningful rather than a small-sample fluke. The 64.3-minute average delay applies only to flights that actually ran late, so it is not the average wait across all departures — the majority of flights on this route depart on time under the BTS definition of a delay (15+ minutes past schedule).

Looking at recent months, Oct 2024 posted the best performance on this corridor at 86% on-time, while Dec 2025 came in at 42% on-time — a 43-point gap between best and worst recent month. For travelers evaluating the ORD to BOI route, the combination of a 81.1% on-time rate, 64.3-minute average delay, 0.6% recent cancellation rate, and 21 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.