Boston to Chicago

What the Data Says About BOS to ORD

The Boston to Chicago corridor (BOS → ORD) covers roughly 867 miles and is served by 46 carriers, based on Bureau of Transportation Statistics reporting. Across 35,774 flights in the dataset, this route posts a 82.1% on-time rate with an average delay of 83.7 minutes when flights run late. Over the most recent 24 months of BTS data, 14,222 flights were recorded on this pairing — 206 cancelled (1.4%) and 38 diverted (0.3%). Those baseline metrics tell you what to expect before you book.

Having 46 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 35,774 total flights analyzed, the 82.1% on-time figure is statistically meaningful rather than a small-sample fluke. The 83.7-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 94% on-time, while Oct 2025 came in at 64% on-time — a 30-point gap between best and worst recent month. For travelers evaluating the BOS to ORD route, the combination of a 82.1% on-time rate, 83.7-minute average delay, 1.4% recent cancellation rate, and 46 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.