Airport reliability
Nantucket (ACK) on-time performance
How reliably flights leave Nantucket, MA (ACK) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.
Nantucket, MA1,758 departures in 12 months
- Departures on time
- 65.8% U.S. average 75.6%
- Cancelled
- 7.1% U.S. average 1.9%
- 60+ minutes late
- 13.1% U.S. average 8.1%
- Scheduled departures
- 1,758 12 months
What this means
ACK departures ran below the U.S. average.
- 65.8% of the 1,758 scheduled departures from Nantucket (ACK) arrived at their destination on time, 9.8 points lower than the U.S. average of 75.6%.
- 7.1% of departures were cancelled (U.S. average 1.9%), and 13.1% arrived an hour or more late.
- Flights arriving at ACK were on time 73.1% of the time.
- Among airlines with at least 300 departures, Republic Airways was the most punctual from ACK (68.4%) and JetBlue Airways the least (63.3%).
- Over the last 3 years, October was the most reliable month for departures from ACK (77.6% on time) and July the least reliable (62.2%).
- Cancellations peaked in July, when 8.9% of flights were cancelled.
- Flights scheduled to depart 11 am to noon were the most punctual (78.4% on time); flights scheduled to depart 5 pm to 6 pm were the least (49.1%).
Airlines at ACK
Ranked by on-time arrival
| Airline | On time | Cancelled | 60+ min late | Avg delay when late | Departures |
|---|---|---|---|---|---|
| Republic AirwaysSold as American Eagle, Delta Connection, United Express | 68.4% | 7.2% | 12.0% | 92 min | 833 |
| JetBlue Airways | 63.3% | 7.3% | 13.9% | 83 min | 877 |
| Envoy AirSold as American Eagle | Insufficient sample | 24 | |||
| SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska | Insufficient sample | 24 | |||
Tap a heading to sort.
On-time rate by departure hour
Share of scheduled flights on time ACK average 65.8%
Show as table
| Period | On time | Flights |
|---|---|---|
| Departing 9 am to 10 am | Insufficient sample | 5 |
| Departing 10 am to 11 am | 75.6% | 197 |
| Departing 11 am to noon | 78.4% | 190 |
| Departing noon to 1 pm | 69.2% | 305 |
| Departing 1 pm to 2 pm | 71.8% | 131 |
| Departing 2 pm to 3 pm | 70.4% | 135 |
| Departing 3 pm to 4 pm | 60.2% | 259 |
| Departing 4 pm to 5 pm | 59.1% | 247 |
| Departing 5 pm to 6 pm | 49.1% | 161 |
| Departing 6 pm to 7 pm | 56.4% | 117 |
| Departing 7 pm to 8 pm | Insufficient sample | 11 |
Best and worst months at ACK
Share of scheduled flights on time 12-month average 65.8%
Show as table
| Period | On time | Flights |
|---|---|---|
| January | Insufficient sample | 0 |
| February | Insufficient sample | 0 |
| March | Insufficient sample | 0 |
| April | Insufficient sample | 0 |
| May | 72.8% | 243 |
| June | 69.5% | 1,002 |
| July | 62.2% | 1,521 |
| August | 72.1% | 1,504 |
| September | 73.6% | 583 |
| October | 77.6% | 245 |
| November | Insufficient sample | 0 |
| December | Insufficient sample | 0 |
Month by month, last 12 months
Share of scheduled flights on time U.S. average 75.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Sep 2025 | 68.4% | 177 |
| Oct 2025 | 70.4% | 71 |
| Nov 2025 | Insufficient sample | 0 |
| Dec 2025 | Insufficient sample | 0 |
| Jan 2026 | Insufficient sample | 0 |
| Feb 2026 | Insufficient sample | 0 |
| Mar 2026 | Insufficient sample | 0 |
| Apr 2026 | Insufficient sample | 0 |
| May 2026 | 71.2% | 59 |
| Jun 2026 | 72.5% | 356 |
| Jul 2026 | 58.2% | 546 |
| Aug 2026 | 66.8% | 549 |
Busiest routes from ACK
| To | On time | Cancelled | Airlines | Flights |
|---|---|---|---|---|
| New York (LGA) | 66.7% | 8.5% | 2 | 411 |
| Boston (BOS) | 66.3% | 4.1% | 2 | 315 |
| New York (JFK) | 59.1% | 13.3% | 2 | 301 |
| Washington (DCA) | 64.7% | 5.6% | 2 | 286 |
| White Plains (HPN) | 67.9% | 5.6% | 1 | 234 |
| Philadelphia (PHL) | 73.0% | 4.6% | 1 | 152 |
Sources & data dates
- Source
- U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
- Period
- September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
- Data through
- August 2026
- Processed
- 2026-11-03
- Scope
- Scheduled nonstop domestic departures from Nantucket, MA (ACK) by airlines that report to the DOT.
- Method
- Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.