Best Time to Fly BOS to ACK: On-Time Stats by Hour & Airline
Logan International → Nantucket Memorial
Data through July 2026 · Last updated October 18, 2026
284 flights were scheduled from Boston (BOS) to Nantucket (ACK) in the last 12 months, and 83.0% of those that flew arrived on time, 5.4 points above the US average of 77.6%.
JetBlue was the most punctual of the 2 airlines on the route at 83.7%, while Republic Airways trailed at 79.5%.
September has been the best month (86% on time) and Monday the weakest day of the week (69%).
2.5% of flights were cancelled, versus 1.8% nationally.
BOS 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 | 83.7% | 69 min | 2.9% | 240 |
| Republic Airways | 79.5% | 31 min | 0.0% | 44 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BOS to ACK
On-time arrival % by scheduled departure hour (local time), 496 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 15 | |
| 9am–10am | 81.0% | 2.7% | 146 |
| 10am–11am | 80.0% | 0.0% | 30 |
| 11am–12pm | Limited data | 20 | |
| 12pm–1pm | 80.7% | 1.6% | 252 |
| 1pm–2pm | Limited data | 7 | |
| 2pm–3pm | Limited data | 1 | |
| 3pm–4pm | Limited data | 4 | |
| 4pm–5pm | Limited data | 21 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BOS 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) | 79.8% | -1.6 pts | 2.5% | 279 |
| All other days | 81.4% | — | 0.9% | 217 |
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).