Islip (ISP) to Fort Lauderdale (FLL): On-Time Performance
Data through July 2026
Islip (ISP) to Fort Lauderdale (FLL) effectively runs on two schedules. In April 2026, 87% of arrivals were on time; in January 2026 that fell to 52% — a 36-point seasonal swing. Across the full period the route averages 71% on-time against a national 78%. Morning departures also hold up better than evening ones (76% vs 66%), which matters most in the rough months.
- On-time
- 71%
- arrived <15 min late
- Avg delay
- 23 min
- completed flights
- Cancelled
- 1.3%
- Flights/day
- 1.1
- last 12 months
- Duration
- 3h 3m
- scheduled
- Distance
- 1,092 mi
Best airline from ISP to FLL
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 73% | 22 min | 1.0% | 587 |
| Frontier Airlines | 67% | 29 min | 2.2% | 184 |
Monthly on-time trend
Best time to fly from ISP to FLL
Aim for departures around 6 a.m. (84% on-time); avoid 4 p.m. departures (45%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 66% | 26 min |
| Tuesday | 77% | 19 min |
| Wednesdaybest | 80% | 11 min |
| Thursday | 67% | 18 min |
| Friday | 74% | 31 min |
| Saturday | 72% | 17 min |
| Sunday | 62% | 44 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft42%
- Airline operations33%
- National airspace system21%
- Weather4%
Frequently asked questions
- How often are flights from ISP to FLL delayed?
- 29% of ISP–FLL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 23 minutes.
- Which airline is most reliable from ISP to FLL?
- JetBlue Airways has the best on-time record on this route at 73%, based on 587 flights. 2 airlines flew ISP–FLL frequently enough to compare in this period.
- What is the best time of day to fly from ISP to FLL?
- Departures around 6 a.m. have the best record (84% on-time), while departures around 4 p.m. have the worst (45%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ISP to FLL?
- The scheduled ISP–FLL flight time averages 3h 3m over 1,092 miles. Actual arrival times vary — flights on this route land 15+ minutes late 29% of the time.
- How often are ISP to FLL flights cancelled?
- 1.3% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ISP to FLL?
- January 2026 was the roughest month in this dataset, with only 52% of arrivals on time. The best was April 2026 at 87%. If your dates are flexible, that 36-point gap is worth planning around.
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Based on 777 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.