Chicago to Green Bay

What the Data Says About ORD to GRB

The Chicago to Green Bay corridor (ORD → GRB) covers roughly 173 miles and is served by 17 carriers, based on Bureau of Transportation Statistics reporting. Across 9,678 flights in the dataset, this route posts a 79.4% on-time rate with an average delay of 72.9 minutes when flights run late. Over the most recent 24 months of BTS data, 4,119 flights were recorded on this pairing — 91 cancelled (2.2%) and 6 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 17 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 9,678 total flights analyzed, the 79.4% on-time figure is statistically meaningful rather than a small-sample fluke. The 72.9-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, Feb 2024 posted the best performance on this corridor at 90% on-time, while Dec 2025 came in at 53% on-time — a 37-point gap between best and worst recent month. For travelers evaluating the ORD to GRB route, the combination of a 79.4% on-time rate, 72.9-minute average delay, 2.2% recent cancellation rate, and 17 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.