Nantucket Memorial Airport (ACK): Delays & On-Time Performance
Data through July 2026
Nantucket Memorial Airport (ACK) in Nantucket, MA is a middle-of-the-pack performer: 77% of departures are on time, within a few points of the national 78%. It hosts 4 airlines flying 5 departures a day to 8 destinations, with cancellations at 5.9%.
- Departures on-time
- 77%
- left <15 min late
- Avg dep delay
- 22 min
- Arrivals on-time
- 81%
- Cancelled
- 5.9%
- Destinations
- 8
- nonstop
- Airlines
- 4
Plan your departure from ACK
The choices most likely to improve your odds, based on this airport’s historical record.
- Best departure time
- Around 10 a.m.
- 84% on-time
- Best day to fly
- Tuesday
- 78% on-time
- Cancellation risk
- 5.9%
- above the US average
Monthly on-time trend
Best time of day to depart from ACK
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 71% | 33 min |
| Tuesdaybest | 78% | 20 min |
| Wednesday | 75% | 20 min |
| Thursday | 72% | 25 min |
| Friday | 76% | 21 min |
| Saturday | 74% | 22 min |
| Sunday | 66% | 28 min |
Busiest routes from ACK
| Route | Flights/12mo | On-time | Avg delay |
|---|---|---|---|
| ACK → LGA (New York) | 412 | 77% | 22 min |
| ACK → JFK (New York) | 301 | 70% | 29 min |
| ACK → BOS (Boston) | 284 | 73% | 22 min |
| ACK → DCA (Washington) | 283 | 72% | 20 min |
| ACK → HPN (White Plains) | 234 | 78% | 24 min |
| ACK → PHL (Philadelphia) | 122 | 67% | 28 min |
Where flights into ACK come from
| Route | Flights/12mo | On-time | Avg delay |
|---|---|---|---|
| LGA (New York) → ACK | 412 | 82% | 12 min |
| JFK (New York) → ACK | 301 | 81% | 15 min |
| BOS (Boston) → ACK | 284 | 81% | 16 min |
| DCA (Washington) → ACK | 283 | 77% | 13 min |
| HPN (White Plains) → ACK | 234 | 84% | 13 min |
| PHL (Philadelphia) → ACK | 122 | 81% | 12 min |
What causes delays at ACK
Share of total delay minutes by cause, as reported by carriers to the US DOT, weighted across routes departing ACK.
- Late-arriving aircraft39%
- Airline operations20%
- National airspace system37%
- Weather3%
Alternative airports near Nantucket
Other airports within 120 miles, compared on departure reliability.
| Airport | Distance | On-time departures | Avg delay |
|---|---|---|---|
| MVY — Martha's Vineyard Airport | 30 mi | 77% | 24 min |
| PVD — Rhode Island T. F. Green International Airport | 78 mi | 81% | 16 min |
| BOS — Boston Logan International Airport | 91 mi | 78% | 17 min |
| ORH — Worcester Regional Airport | 117 mi | 78% | 23 min |
Compare the airport-level record first, then check the exact route you plan to book.
Airline performance at ACK
| Airline | On-time departures | Avg delay | Flights |
|---|---|---|---|
| Republic Airways | 78% | 20 min | 1,644 |
| JetBlue Airways | 77% | 23 min | 2,010 |
Frequently asked questions
- How often are flights delayed at ACK?
- 23% of departures from Nantucket Memorial Airport left 15+ minutes late between 2024-07 and 2026-07, with an average departure delay of 22 minutes. The national on-time average over the same period was 78%.
- What is the best time of day to depart from ACK?
- Flights scheduled around 10 a.m. depart on time 84% of the time at ACK, versus 71% around 4 p.m.. Booking before noon is the usual rule of thumb here.
- How often are flights cancelled at ACK?
- 5.9% of scheduled departures from ACK were cancelled in this period, compared with a national rate of 1.6%.
Popular route pages from this airport
Related guides
Based on 3,745 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.