Chicago to Boston

What the Data Says About ORD to BOS

The Chicago to Boston corridor (ORD → BOS) covers roughly 867 miles and is served by 47 carriers, based on Bureau of Transportation Statistics reporting. Across 35,759 flights in the dataset, this route posts a 78.5% on-time rate with an average delay of 79.0 minutes when flights run late. Over the most recent 24 months of BTS data, 14,227 flights were recorded on this pairing — 197 cancelled (1.4%) and 27 diverted (0.2%). Those baseline metrics tell you what to expect before you book.

Having 47 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 35,759 total flights analyzed, the 78.5% on-time figure is statistically meaningful rather than a small-sample fluke. The 79.0-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 85% on-time, while Sep 2025 came in at 57% on-time — a 29-point gap between best and worst recent month. For travelers evaluating the ORD to BOS route, the combination of a 78.5% on-time rate, 79.0-minute average delay, 1.4% recent cancellation rate, and 47 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.