Green Bay to Chicago

What the Data Says About GRB to ORD

The Green Bay to Chicago corridor (GRB → ORD) covers roughly 173 miles and is served by 18 carriers, based on Bureau of Transportation Statistics reporting. Across 9,675 flights in the dataset, this route posts a 81.7% on-time rate with an average delay of 88.3 minutes when flights run late. Over the most recent 24 months of BTS data, 4,117 flights were recorded on this pairing — 94 cancelled (2.3%) and 2 diverted (0.0%). Those baseline metrics tell you what to expect before you book.

Having 18 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 9,675 total flights analyzed, the 81.7% on-time figure is statistically meaningful rather than a small-sample fluke. The 88.3-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, Feb 2024 posted the best performance on this corridor at 90% on-time, while Dec 2025 came in at 62% on-time — a 28-point gap between best and worst recent month. For travelers evaluating the GRB to ORD route, the combination of a 81.7% on-time rate, 88.3-minute average delay, 2.3% recent cancellation rate, and 18 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.