Boston to Miami

What the Data Says About BOS to MIA

The Boston to Miami corridor (BOS → MIA) covers roughly 1,258 miles and is served by 34 carriers, based on Bureau of Transportation Statistics reporting. Across 20,541 flights in the dataset, this route posts a 79.4% on-time rate with an average delay of 73.6 minutes when flights run late. Over the most recent 24 months of BTS data, 7,512 flights were recorded on this pairing — 102 cancelled (1.4%) and 25 diverted (0.3%). Those baseline metrics tell you what to expect before you book.

Having 34 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 20,541 total flights analyzed, the 79.4% on-time figure is statistically meaningful rather than a small-sample fluke. The 73.6-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, Oct 2024 posted the best performance on this corridor at 91% on-time, while Dec 2025 came in at 71% on-time — a 21-point gap between best and worst recent month. For travelers evaluating the BOS to MIA route, the combination of a 79.4% on-time rate, 73.6-minute average delay, 1.4% recent cancellation rate, and 34 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.