Boston to Nantucket

What the Data Says About BOS to ACK

The Boston to Nantucket corridor (BOS → ACK) covers roughly 91 miles and is served by 1 carrier, based on Bureau of Transportation Statistics reporting. Across 895 flights in the dataset, this route posts a 80.4% on-time rate with an average delay of 81.5 minutes when flights run late. Over the most recent 24 months of BTS data, 895 flights were recorded on this pairing — 25 cancelled (2.8%) and 1 diverted (0.1%). Those baseline metrics tell you what to expect before you book.

Having 1 carrier on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 895 total flights analyzed, the 80.4% on-time figure is statistically meaningful rather than a small-sample fluke. The 81.5-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, Aug 2021 posted the best performance on this corridor at 94% on-time, while Jul 2021 came in at 65% on-time — a 29-point gap between best and worst recent month. For travelers evaluating the BOS to ACK route, the combination of a 80.4% on-time rate, 81.5-minute average delay, 2.8% recent cancellation rate, and 1 available carrier is the concrete summary of what BTS data shows about reliability on this pairing.