Charlotte Amalie to San Juan

What the Data Says About STT to SJU

The Charlotte Amalie to San Juan corridor (STT → SJU) covers roughly 68 miles and is served by 6 carriers, based on Bureau of Transportation Statistics reporting. Across 3,424 flights in the dataset, this route posts a 74.3% on-time rate with an average delay of 88.1 minutes when flights run late. Over the most recent 24 months of BTS data, 1,316 flights were recorded on this pairing — 18 cancelled (1.4%) and 3 diverted (0.2%). Those baseline metrics tell you what to expect before you book.

Having 6 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 3,424 total flights analyzed, the 74.3% on-time figure is statistically meaningful rather than a small-sample fluke. The 88.1-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, Apr 2025 posted the best performance on this corridor at 84% on-time, while Feb 2024 came in at 64% on-time — a 20-point gap between best and worst recent month. For travelers evaluating the STT to SJU route, the combination of a 74.3% on-time rate, 88.1-minute average delay, 1.4% recent cancellation rate, and 6 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.