Best Time to Fly ACK to LGA: On-Time Stats by Hour & Airline
Nantucket Memorial → LaGuardia
Data through July 2026 · Last updated October 18, 2026
412 flights were scheduled from Nantucket (ACK) to New York (LGA) in the last 12 months, and 76.5% of those that flew arrived on time, 1.1 points below the US average of 77.6%.
JetBlue was the most punctual of the 2 airlines on the route at 82.0%, while Republic Airways trailed at 74.8%.
September has been the best month (86% on time) and Sunday the weakest day of the week (70%).
5.8% of flights were cancelled, versus 1.8% nationally.
ACK to LGA 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 | 82.0% | 92 min | 3.3% | 92 |
| Republic Airways | 74.8% | 90 min | 6.6% | 320 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ACK to LGA
On-time arrival % by scheduled departure hour (local time), 828 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 11am–12pm | 84.8% | 2.9% | 210 |
| 12pm–1pm | 76.4% | 1.7% | 181 |
| 1pm–2pm | 81.7% | 3.7% | 108 |
| 2pm–3pm | 76.5% | 16.1% | 81 |
| 3pm–4pm | Limited data | 22 | |
| 4pm–5pm | 71.7% | 11.2% | 196 |
| 6pm–7pm | Limited data | 20 | |
| 7pm–8pm | Limited data | 10 | |
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 LGA
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) | 72.2% | -13.5 pts | 7.3% | 492 |
| All other days | 85.6% | — | 4.5% | 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).