Best Time to Fly PBI to ISP: On-Time Stats by Hour & Airline
Palm Beach International → Long Island MacArthur
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 74.0% of West Palm Beach/Palm Beach (PBI) to Islip (ISP) flights arrived on time (1,222 scheduled flights). That is 3.6 points below the national average of 77.6%.
JetBlue was the most punctual of the 3 airlines on the route at 76.8%, while Frontier Airlines trailed at 50.0%.
September has been the best month (89% on time) and Sunday the weakest day of the week (68%).
1.6% of flights were cancelled, versus 1.8% nationally.
PBI to ISP 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 | 76.8% | 65 min | 1.8% | 573 |
| Southwest Airlines | 73.9% | 54 min | 1.0% | 580 |
| Frontier Airlines | 50.0% | 66 min | 5.8% | 69 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PBI to ISP
On-time arrival % by scheduled departure hour (local time), 2,338 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 89.6% | 0.0% | 77 |
| 7am–8am | 93.8% | 1.0% | 195 |
| 8am–9am | 90.7% | 0.0% | 97 |
| 9am–10am | 76.2% | 4.5% | 44 |
| 10am–11am | 85.2% | 0.0% | 272 |
| 11am–12pm | 74.7% | 1.3% | 302 |
| 12pm–1pm | 76.8% | 0.9% | 348 |
| 1pm–2pm | 70.2% | 0.8% | 125 |
| 2pm–3pm | 73.4% | 0.0% | 79 |
| 3pm–4pm | 62.4% | 0.8% | 127 |
| 4pm–5pm | 64.1% | 0.0% | 78 |
| 5pm–6pm | 68.8% | 0.0% | 32 |
| 6pm–7pm | 59.8% | 0.0% | 82 |
| 7pm–8pm | 51.8% | 2.1% | 142 |
| 8pm–9pm | 70.4% | 0.7% | 144 |
| 9pm–10pm | 59.5% | 5.8% | 120 |
| 10pm–11pm | 68.5% | 1.4% | 74 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PBI to ISP
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) | 81.4% | +4.8 pts | 4.4% | 45 |
| Christmas & New Year (Dec 20 - Jan 3) | 61.8% | -14.7 pts | 2.2% | 134 |
| Summer peak (Jun 15 - Aug 15) | 68.4% | -8.1 pts | 0.3% | 363 |
| All other days | 76.6% | — | 1.1% | 1,796 |
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).