Best Time to Fly ACK to JFK: On-Time Stats by Hour & Airline
Nantucket Memorial → John F. Kennedy International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 72.3% of Nantucket (ACK) to New York (JFK) flights arrived on time (301 scheduled flights). That is 5.4 points below the national average of 77.6%.
Among 2 airlines, JetBlue led with 75.1% on time and Republic Airways was last with 67.3%.
Over 24 months, Friday was the most reliable day (79% on time) and June the worst month (60%).
The cancellation rate was 9.0% (US average 1.8%).
ACK to JFK 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 | 75.1% | 73 min | 9.4% | 191 |
| Republic Airways | 67.3% | 74 min | 8.2% | 110 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ACK to JFK
On-time arrival % by scheduled departure hour (local time), 626 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 11am–12pm | 72.7% | 2.9% | 34 |
| 12pm–1pm | 71.5% | 8.2% | 134 |
| 2pm–3pm | 73.9% | 8.0% | 50 |
| 3pm–4pm | 62.5% | 9.1% | 176 |
| 4pm–5pm | 65.7% | 9.7% | 145 |
| 5pm–6pm | 87.5% | 8.1% | 87 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ACK to JFK
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) | 65.4% | -10.4 pts | 13.2% | 356 |
| All other days | 75.8% | — | 2.2% | 270 |
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).