Islip (ISP) Delays
#111 U.S. airport by BTS-tracked flight volume · 74.3% on-time departures, 74% on-time arrivals over the last 12 months · 2015–2026
5,020Flights
74.3%Departures on-time
19.7 minAvg dep. delay
74%Arrivals on-time
17.4 minAvg arr. delay
2%Cancelled
Delay causes (last 12 months)
- Air carrier27.2%
- Extreme weather2.5%
- National Aviation System26.4%
- Security0%
- Late-arriving aircraft44%
By year
| Year | Flights | Dep on-time | Arr on-time | Avg dep delay | Cancelled |
|---|---|---|---|---|---|
| 2026 | 2,136 | 75% | 73.1% | 16.9 min | 3.3% |
| 2025 | 5,283 | 76.2% | 76.3% | 19.6 min | 1% |
| 2024 | 4,777 | 76.7% | 76.1% | 18.3 min | 1.9% |
| 2023 | 4,698 | 76.4% | 74.6% | 18 min | 1.6% |
| 2022 | 4,708 | 73.9% | 69.3% | 18.5 min | 4.6% |
| 2021 | 4,358 | 77.8% | 75.7% | 15.6 min | 2.3% |
| 2020 | 3,322 | 92.6% | 89.6% | 5 min | 10.3% |
| 2019 | 5,564 | 83.8% | 79% | 12.5 min | 1.7% |
| 2018 | 6,151 | 80.8% | 76.5% | 16.4 min | 3.2% |
| 2017 | 5,235 | 82.5% | 81% | 12.7 min | 1.9% |
| 2016 | 4,706 | 86.1% | 81.9% | 9.2 min | 1.8% |
| 2015 | 4,758 | 81.7% | 78% | 12.1 min | 2.8% |
On-time = arrival within 15 minutes of schedule, per U.S. DOT definitions. Source: Bureau of Transportation Statistics (public domain). Delay-cause attribution is reported by carriers since June 2003.