Best Time to Fly LGA to ACK: On-Time Stats by Hour & Airline
LaGuardia → Nantucket Memorial
Data through July 2026 · Last updated October 18, 2026
412 flights were scheduled from New York (LGA) to Nantucket (ACK) in the last 12 months, and 81.8% of those that flew arrived on time, 4.1 points above the US average of 77.6%.
Among 2 airlines, Republic Airways led with 82.4% on time and JetBlue was last with 79.5%.
Over 24 months, Tuesday was the most reliable day (87% on time) and July the worst month (78%).
The cancellation rate was 3.4% (US average 1.8%).
LGA 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 |
|---|---|---|---|---|
| Republic Airways | 82.4% | 51 min | 3.1% | 320 |
| JetBlue | 79.5% | 54 min | 4.3% | 92 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LGA to ACK
On-time arrival % by scheduled departure hour (local time), 828 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 9am–10am | 92.8% | 1.0% | 99 |
| 10am–11am | 84.9% | 1.2% | 163 |
| 11am–12pm | 88.5% | 2.0% | 98 |
| 12pm–1pm | 84.5% | 6.2% | 64 |
| 1pm–2pm | 81.2% | 3.8% | 210 |
| 2pm–3pm | 76.9% | 4.3% | 163 |
| 3pm–4pm | Limited data | 2 | |
| 4pm–5pm | Limited data | 23 | |
| 5pm–6pm | Limited data | 6 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LGA 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) | 79.2% | -9.9 pts | 4.3% | 492 |
| All other days | 89.1% | — | 1.5% | 336 |
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).