Fort Lauderdale (FLL) to Islip (ISP): On-Time Performance
Data through May 2026
The calendar drives reliability on FLL–ISP. August 2025 flights landed on schedule 97% of the time, but August 2024 dropped to 49% — a gap of 48 points. Across the full period the route averages 75% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 56%), which matters most in the rough months.
- On-time
- 75%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 2.2%
- Flights/day
- 1.0
- last 12 months
- Duration
- 2h 52m
- scheduled
- Distance
- 1,092 mi
Best airline from FLL to ISP
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 80% | 13 min | 1.4% | 505 |
| Frontier Airlines | 63% | 29 min | 4.2% | 213 |
Monthly on-time trend
Best time to fly from FLL to ISP
Aim for departures around 8 a.m. (91% on-time); avoid 10 p.m. departures (57%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 70% | 22 min |
| Tuesday | 82% | 15 min |
| Wednesdaybest | 85% | 9 min |
| Thursday | 68% | 24 min |
| Friday | 80% | 12 min |
| Saturday | 79% | 13 min |
| Sunday | 53% | 36 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft54%
- Airline operations30%
- National airspace system15%
- Weather2%
Frequently asked questions
- How often are flights from FLL to ISP delayed?
- 25% of FLL–ISP flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 18 minutes.
- Which airline is most reliable from FLL to ISP?
- JetBlue Airways has the best on-time record on this route at 80%, based on 505 flights. 2 airlines flew FLL–ISP frequently enough to compare in this period.
- What is the best time of day to fly from FLL to ISP?
- Departures around 8 a.m. have the best record (91% on-time), while departures around 10 p.m. have the worst (57%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from FLL to ISP?
- The scheduled FLL–ISP flight time averages 2h 52m over 1,092 miles. Actual arrival times vary — flights on this route land 15+ minutes late 25% of the time.
- How often are FLL to ISP flights cancelled?
- 2.2% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What is the worst month to fly from FLL to ISP?
- August 2024 was the roughest month in this dataset, with only 49% of arrivals on time. The best was August 2025 at 97%. If your dates are flexible, that 48-point gap is worth planning around.
Explore related pages
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Based on 724 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.