Nantucket to Boston

What the Data Says About ACK to BOS

The Nantucket to Boston corridor (ACK → BOS) covers roughly 91 miles and is served by 1 carrier, based on Bureau of Transportation Statistics reporting. Across 894 flights in the dataset, this route posts a 75.7% on-time rate with an average delay of 82.5 minutes when flights run late. Over the most recent 24 months of BTS data, 894 flights were recorded on this pairing — 30 cancelled (3.4%) and 0 diverted (0.0%). 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 894 total flights analyzed, the 75.7% on-time figure is statistically meaningful rather than a small-sample fluke. The 82.5-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 87% on-time, while Jul 2025 came in at 65% on-time — a 23-point gap between best and worst recent month. For travelers evaluating the ACK to BOS route, the combination of a 75.7% on-time rate, 82.5-minute average delay, 3.4% recent cancellation rate, and 1 available carrier is the concrete summary of what BTS data shows about reliability on this pairing.