Airport Reliability
ISP · Islip
Islip, NY (ISP)
- 75%
- Departures within 15 minutes
- 16 min
- Average departure delay
- 75%
- Arrivals within 15 minutes
- 2.0%
- Departures cancelled
Based on 5,020 departures and 5,019 arrivals. Data through May 2026.
What the data says
Morning flights do better here.
Departures from ISP departing between 3–6 AM arrived on time 93% of the time, versus 57% between 6–9 PM.
Sunday scaries are real for this one.
Departures from ISP arrived on time 78% of the time on Wednesdays. On Sundays: 71%.
Trending in the right direction.
Departures from ISP arrived on time 78% of the time over the last three months in the data, compared with 70% in the three months before that.
When ISP gets messy
- 3–6 AM93%(254 flights)
- 6–9 AM87%(1020 flights)
- 9 AM–12 PM83%(832 flights)
- 12–3 PM71%(1162 flights)
- 3–6 PM67%(1221 flights)
- 6–9 PM57%(366 flights)
- 9 PM–12 AM91%(44 flights)
- Mon74%(708 flights)
- Tue77%(629 flights)
- Wed78%(660 flights)
- Thu76%(693 flights)
- Fri75%(751 flights)
- Sat76%(749 flights)
- Sun71%(709 flights)
84%
May
Jun 72% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 72% | 445 |
| July 2025 | 70% | 450 |
| August 2025 | 73% | 399 |
| September 2025 | 85% | 348 |
| October 2025 | 85% | 361 |
| November 2025 | 78% | 391 |
| December 2025 | 65% | 446 |
| January 2026 | 71% | 414 |
| February 2026 | 73% | 402 |
| March 2026 | 72% | 395 |
| April 2026 | 78% | 457 |
| May 2026 | 84% | 391 |
Airlines departing ISP
Busiest routes from ISP
Based on 5,020 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.