Nantucket (ACK) to Boston (BOS): On-Time Performance
Data through July 2026
Nantucket (ACK) to Boston (BOS) is a thinner route than most in this dataset — 284 departures over the past year, roughly 5 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 73% arrived on time, noticeably below the national average of 78%. Cancellations are the bigger caveat: 3.3% of scheduled flights never departed.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 22 min
- completed flights
- Cancelled
- 3.3%
- Flights/day
- 0.78
- last 12 months
- Duration
- 57m
- scheduled
- Distance
- 91 mi
Monthly on-time trend
Best time to fly from ACK to BOS
Aim for departures around 10 a.m. (89% on-time); avoid 6 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 68% | 33 min |
| Tuesday | 74% | 19 min |
| Wednesday | 73% | 27 min |
| Thursday | 69% | 24 min |
| Friday | 74% | 17 min |
| Saturdaybest | 83% | 9 min |
| Sunday | 68% | 24 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft50%
- Airline operations7%
- National airspace system43%
Frequently asked questions
- How often are flights from ACK to BOS delayed?
- 28% of ACK–BOS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 22 minutes.
- What is the best time of day to fly from ACK to BOS?
- Departures around 10 a.m. have the best record (89% on-time), while departures around 6 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ACK to BOS?
- The scheduled ACK–BOS flight time averages 57m over 91 miles. Actual arrival times vary — flights on this route land 15+ minutes late 28% of the time.
- How often are ACK to BOS flights cancelled?
- 3.3% of scheduled flights on this route were cancelled between 2024-07 and 2026-07 — several times the typical US rate, so consider earlier departures or backup options.
- What day of the week is most reliable for ACK to BOS?
- Saturday flights have the best record at 83% on-time. Day-of-week differences on this route are meaningful — Monday trails at 68%.
Explore related pages
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Other ways to fly to Boston (BOS)
Related guides
Based on 548 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.