Fort Lauderdale (FLL) to Islip (ISP): On-Time Performance
Data through July 2026
The calendar drives reliability on FLL–ISP. August 2025 flights landed on schedule 97% of the time, but July 2026 dropped to 47% — a gap of 50 points. Across the full period the route averages 74% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 58%), which matters most in the rough months.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 2.1%
- Flights/day
- 1.1
- last 12 months
- Duration
- 2h 52m
- scheduled
- Distance
- 1,092 mi
Best airline from FLL to ISP
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 78% | 15 min | 1.4% | 588 |
| Frontier Airlines | 62% | 30 min | 4.4% | 183 |
Monthly on-time trend
Best time to fly from FLL to ISP
Aim for departures around 8 a.m. (91% on-time); avoid 4 p.m. departures (57%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 68% | 23 min |
| Tuesday | 82% | 18 min |
| Wednesdaybest | 85% | 9 min |
| Thursday | 70% | 22 min |
| Friday | 80% | 14 min |
| Saturday | 77% | 14 min |
| Sunday | 53% | 34 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft55%
- Airline operations29%
- National airspace system14%
- Weather2%
Frequently asked questions
- How often are flights from FLL to ISP delayed?
- 26% of FLL–ISP 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 18 minutes.
- Which airline is most reliable from FLL to ISP?
- JetBlue Airways has the best on-time record on this route at 78%, based on 588 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 4 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 26% of the time.
- How often are FLL to ISP flights cancelled?
- 2.1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from FLL to ISP?
- July 2026 was the roughest month in this dataset, with only 47% of arrivals on time. The best was August 2025 at 97%. If your dates are flexible, that 50-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.