Islip to West Palm Beach/Palm Beach

What the Data Says About ISP to PBI

The Islip to West Palm Beach/Palm Beach corridor (ISP → PBI) covers roughly 1,052 miles and is served by 8 carriers, based on Bureau of Transportation Statistics reporting. Across 4,604 flights in the dataset, this route posts a 76.2% on-time rate with an average delay of 73.5 minutes when flights run late. Over the most recent 24 months of BTS data, 2,259 flights were recorded on this pairing — 25 cancelled (1.1%) and 9 diverted (0.4%). Those baseline metrics tell you what to expect before you book.

Having 8 carriers on the route matters: more carriers generally means more daily schedule options, competitive pricing, and redundancy when flights are cancelled. With 4,604 total flights analyzed, the 76.2% on-time figure is statistically meaningful rather than a small-sample fluke. The 73.5-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, Nov 2024 posted the best performance on this corridor at 93% on-time, while Dec 2025 came in at 58% on-time — a 35-point gap between best and worst recent month. For travelers evaluating the ISP to PBI route, the combination of a 76.2% on-time rate, 73.5-minute average delay, 1.1% recent cancellation rate, and 8 available carriers is the concrete summary of what BTS data shows about reliability on this pairing.