Best Time to Fly ISP to PBI: On-Time Stats by Hour & Airline
Long Island MacArthur → Palm Beach International
Data through July 2026 · Last updated October 18, 2026
1,221 flights were scheduled from Islip (ISP) to West Palm Beach/Palm Beach (PBI) in the last 12 months, and 72.2% of those that flew arrived on time, 5.4 points below the US average of 77.6%.
Among 3 airlines, JetBlue led with 73.5% on time and Frontier Airlines was last with 69.7%.
Over 24 months, Tuesday was the most reliable day (75% on time) and December the worst month (58%).
The cancellation rate was 2.1% (US average 1.8%).
ISP to PBI 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 | 73.5% | 96 min | 2.5% | 571 |
| Southwest Airlines | 71.3% | 48 min | 1.6% | 581 |
| Frontier Airlines | 69.7% | 86 min | 4.3% | 69 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ISP to PBI
On-time arrival % by scheduled departure hour (local time), 2,338 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 84.1% | 4.3% | 46 |
| 6am–7am | 87.2% | 0.7% | 426 |
| 7am–8am | 91.1% | 1.6% | 184 |
| 8am–9am | 84.5% | 1.4% | 72 |
| 9am–10am | 85.3% | 0.0% | 34 |
| 10am–11am | 77.2% | 4.2% | 96 |
| 11am–12pm | 89.3% | 0.0% | 85 |
| 12pm–1pm | 73.2% | 1.4% | 141 |
| 1pm–2pm | 64.6% | 0.0% | 165 |
| 2pm–3pm | 60.9% | 1.8% | 272 |
| 3pm–4pm | 58.5% | 2.7% | 294 |
| 4pm–5pm | 67.6% | 1.3% | 227 |
| 5pm–6pm | 63.0% | 1.0% | 101 |
| 6pm–7pm | 75.7% | 2.8% | 106 |
| 7pm–8pm | 61.4% | 1.4% | 71 |
| 8pm–9pm | Limited data | 13 | |
| 9pm–10pm | Limited data | 5 | |
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 PBI
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) | 74.4% | -0.5 pts | 4.4% | 45 |
| Christmas & New Year (Dec 20 - Jan 3) | 56.1% | -18.8 pts | 1.5% | 134 |
| Summer peak (Jun 15 - Aug 15) | 73.0% | -1.9 pts | 1.4% | 363 |
| All other days | 74.9% | — | 1.5% | 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).