Best Time to Fly ISP to FLL: On-Time Stats by Hour & Airline
Long Island MacArthur → Fort Lauderdale-Hollywood International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 68.9% of Islip (ISP) to Fort Lauderdale (FLL) flights arrived on time (405 scheduled flights). That is 8.7 points below the national average of 77.6%.
JetBlue was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (80% on time) and December the worst month (62%).
The cancellation rate was 1.7% (US average 1.8%).
ISP to FLL on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue | 71.2% | 87 min | 1.6% | 383 |
| Southwest Airlines | Limited data | 3 | ||
| Frontier Airlines | Limited data | 19 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ISP to FLL
On-time arrival % by scheduled departure hour (local time), 746 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 18 | |
| 6am–7am | 83.7% | 0.0% | 49 |
| 7am–8am | Limited data | 15 | |
| 8am–9am | Limited data | 25 | |
| 9am–10am | Limited data | 11 | |
| 10am–11am | 82.7% | 0.0% | 52 |
| 11am–12pm | 77.4% | 0.0% | 117 |
| 12pm–1pm | 78.0% | 1.5% | 134 |
| 1pm–2pm | 73.5% | 1.4% | 69 |
| 2pm–3pm | Limited data | 11 | |
| 3pm–4pm | 56.9% | 1.5% | 67 |
| 4pm–5pm | 45.0% | 2.4% | 41 |
| 5pm–6pm | 70.4% | 0.0% | 54 |
| 6pm–7pm | Limited data | 8 | |
| 7pm–8pm | Limited data | 23 | |
| 8pm–9pm | 63.6% | 2.9% | 34 |
| 9pm–10pm | Limited data | 18 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ISP to FLL
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 12 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 48.1% | -26.3 pts | 3.7% | 54 |
| Summer peak (Jun 15 - Aug 15) | 69.8% | -4.5 pts | 0.7% | 139 |
| All other days | 74.3% | — | 1.1% | 541 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).