New York (LGA) to Nantucket (ACK): On-Time Performance
Data through May 2026
Republic Airways effectively owns the LGA–ACK corridor, operating 72% of its flights and landing on time 81% of the time. That concentration hasn't hurt reliability: the route beats the national on-time average by 4 points (82% vs 78%).
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 2.5%
- Flights/day
- 1.1
- last 12 months
- Duration
- 1h 18m
- scheduled
- Distance
- 202 mi
Best airline from LGA to ACK
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 86% | 10 min | 2.1% | 239 |
| Republic Airways | 81% | 12 min | 2.7% | 601 |
Monthly on-time trend
Best time to fly from LGA to ACK
Aim for departures around 10 a.m. (87% on-time); avoid 12 p.m. departures (77%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 85% | 10 min |
| Tuesdaybest | 86% | 11 min |
| Wednesday | 82% | 14 min |
| Thursday | 83% | 10 min |
| Friday | 83% | 13 min |
| Saturday | 80% | 13 min |
| Sunday | 79% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft33%
- Airline operations39%
- National airspace system25%
- Weather3%
Frequently asked questions
- How often are flights from LGA to ACK delayed?
- 18% of LGA–ACK flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 12 minutes.
- Which airline is most reliable from LGA to ACK?
- JetBlue Airways has the best on-time record on this route at 86%, based on 239 flights. 2 airlines flew LGA–ACK frequently enough to compare in this period.
- What is the best time of day to fly from LGA to ACK?
- Departures around 10 a.m. have the best record (87% on-time), while departures around 12 p.m. have the worst (77%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from LGA to ACK?
- The scheduled LGA–ACK flight time averages 1h 18m over 202 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are LGA to ACK flights cancelled?
- 2.5% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What day of the week is most reliable for LGA to ACK?
- Tuesday flights have the best record at 86% on-time. Day-of-week differences on this route are modest.
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Based on 840 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.