Best Time to Fly HPN to ACK: On-Time Stats by Hour & Airline
Westchester County → Nantucket Memorial
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.8% of White Plains (HPN) to Nantucket (ACK) flights arrived on time (234 scheduled flights). That is 8.2 points above the national average of 77.6%.
JetBlue was the only reporting airline with regular flights on this route.
September has been the best month (94% on time) and Sunday the weakest day of the week (80%).
3.4% of flights were cancelled, versus 1.8% nationally.
HPN to ACK 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 | 85.8% | 99 min | 3.4% | 234 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly HPN to ACK
On-time arrival % by scheduled departure hour (local time), 460 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 91.1% | 2.5% | 245 |
| 9am–10am | 85.4% | 2.0% | 49 |
| 3pm–4pm | 79.5% | 6.4% | 141 |
| 4pm–5pm | Limited data | 25 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on HPN to ACK
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Summer peak (Jun 15 - Aug 15) | 82.4% | -7.0 pts | 5.3% | 246 |
| All other days | 89.4% | — | 1.4% | 214 |
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).