New York (JFK) to Nantucket (ACK): On-Time Performance
Data through May 2026
New York (JFK) to Nantucket (ACK) is a thinner route than most in this dataset — 311 departures over the past year, roughly 6 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 82% arrived on time. Cancellations are the bigger caveat: 3.9% of scheduled flights never departed.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 3.9%
- Flights/day
- 0.85
- last 12 months
- Duration
- 1h 21m
- scheduled
- Distance
- 199 mi
Best airline from JFK to ACK
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airwaysmost reliable | 86% | 11 min | 2.8% | 214 |
| JetBlue Airways | 79% | 20 min | 4.4% | 432 |
Monthly on-time trend
Best time to fly from JFK to ACK
Aim for departures around 10 a.m. (89% on-time); avoid 9 a.m. departures (71%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 25 min |
| Tuesdaybest | 87% | 11 min |
| Wednesday | 86% | 10 min |
| Thursday | 82% | 12 min |
| Friday | 86% | 16 min |
| Saturday | 81% | 21 min |
| Sunday | 73% | 22 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft30%
- Airline operations48%
- National airspace system15%
- Weather7%
Frequently asked questions
- How often are flights from JFK to ACK delayed?
- 19% of JFK–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 17 minutes.
- Which airline is most reliable from JFK to ACK?
- Republic Airways has the best on-time record on this route at 86%, based on 214 flights. 2 airlines flew JFK–ACK frequently enough to compare in this period.
- What is the best time of day to fly from JFK to ACK?
- Departures around 10 a.m. have the best record (89% on-time), while departures around 9 a.m. have the worst (71%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from JFK to ACK?
- The scheduled JFK–ACK flight time averages 1h 21m over 199 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are JFK to ACK flights cancelled?
- 3.9% of scheduled flights on this route were cancelled between 2024-06 and 2026-05 — several times the typical US rate, so consider earlier departures or backup options.
- What day of the week is most reliable for JFK to ACK?
- Tuesday flights have the best record at 87% on-time. Day-of-week differences on this route are meaningful — Sunday trails at 73%.
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Based on 646 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.