Miami to Boston

What the Data Says About MIA to BOS

The Miami to Boston corridor (MIA → BOS) covers roughly 1,258 miles and is served by 36 carriers, based on Bureau of Transportation Statistics reporting. Across 20,561 flights in the dataset, this route posts a 74.7% on-time rate with an average delay of 77.6 minutes when flights run late. Over the most recent 24 months of BTS data, 7,511 flights were recorded on this pairing — 113 cancelled (1.5%) and 18 diverted (0.2%). Those baseline metrics tell you what to expect before you book.

Having 36 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 20,561 total flights analyzed, the 74.7% on-time figure is statistically meaningful rather than a small-sample fluke. The 77.6-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, Nov 2024 posted the best performance on this corridor at 86% on-time, while Oct 2025 came in at 57% on-time — a 28-point gap between best and worst recent month. For travelers evaluating the MIA to BOS route, the combination of a 74.7% on-time rate, 77.6-minute average delay, 1.5% recent cancellation rate, and 36 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.