Charleston to Boston

What the Data Says About CHS to BOS

The Charleston to Boston corridor (CHS → BOS) covers roughly 818 miles and is served by 16 carriers, based on Bureau of Transportation Statistics reporting. Across 5,870 flights in the dataset, this route posts a 75.3% on-time rate with an average delay of 94.3 minutes when flights run late. Over the most recent 24 months of BTS data, 2,473 flights were recorded on this pairing — 42 cancelled (1.7%) and 5 diverted (0.2%). Those baseline metrics tell you what to expect before you book.

Having 16 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 5,870 total flights analyzed, the 75.3% on-time figure is statistically meaningful rather than a small-sample fluke. The 94.3-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 92% on-time, while Sep 2025 came in at 51% on-time — a 41-point gap between best and worst recent month. For travelers evaluating the CHS to BOS route, the combination of a 75.3% on-time rate, 94.3-minute average delay, 1.7% recent cancellation rate, and 16 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.