Airport Reliability
ACK · Nantucket
Nantucket, MA (ACK)
- 77%
- Departures within 15 minutes
- 19 min
- Average departure delay
- 83%
- Arrivals within 15 minutes
- 4.7%
- Departures cancelled
Based on 1,784 departures and 1,784 arrivals. Data through May 2026.
What the data says
The late departure is the smart one here.
Departures from ACK departing between 6–9 PM arrived on time 78% of the time, versus 62% between 3–6 PM.
Sunday scaries are real for this one.
Departures from ACK arrived on time 75% of the time on Tuesdays. On Sundays: 64%.
Ticking up lately.
Departures from ACK arrived on time 74% of the time over the last three months in the data, compared with 70% in the three months before that.
When ACK gets messy
- 6–9 AM—(2 flights)
- 9 AM–12 PM76%(340 flights)
- 12–3 PM77%(516 flights)
- 3–6 PM62%(723 flights)
- 6–9 PM78%(116 flights)
- Mon70%(230 flights)
- Tue75%(218 flights)
- Wed73%(207 flights)
- Thu67%(236 flights)
- Fri75%(256 flights)
- Sat73%(279 flights)
- Sun64%(271 flights)
77%
May
Jun 66% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 66% | 287 |
| July 2025 | 63% | 509 |
| August 2025 | 80% | 536 |
| September 2025 | 71% | 218 |
| October 2025 | 74% | 68 |
| May 2026 | 77% | 79 |
Airlines departing ACK
Busiest routes from ACK
Based on 1,784 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.