Airport · ACK · Nantucket, Massachusetts
Nantucket, MA
Nantucket, MA posts bottom-quartile on-time performance among the 382 tracked U.S. airports, as a mid-size U.S. airport. According to the U.S. DOT Bureau of Transportation Statistics, drawn from 17,080 flights (2020–2025); its biggest delay driver is late aircraft.
Data updated 2026-06-13
- 80.5%
- On-time
- Top 82%
- on-time, US airports
- 91 min
- Delay when late
- 2.49%
- Cancelled
Key Performance Metrics
Total Flights
17,080
Best Month
Jan 100%
Worst Month
Jul 87.1%
Delayed
3,324
Cancelled
426
ACK on-time rate vs. the national average
Ahead of the U.S. average across all 382 tracked airports.
Where ACK sits among all 382 tracked airports
ACK's 80.5% on-time rate falls in the 80-85% band, the 192-airport band it shares.
National on-time-rate distribution
- 60-65% 1
1 airport between 60% and 65% on-time
1 airports
- 65-70% 4
4 airports between 65% and 70% on-time
4 airports
- 70-75% 9
9 airports between 70% and 75% on-time
9 airports
- 75-80% 48
48 airports between 75% and 80% on-time
48 airports
- 80-85%
192 airports between 80% and 85% on-time
192 airports
- 85-90%
116 airports between 85% and 90% on-time
116 airports
- 90-95% 12
12 airports between 90% and 95% on-time
12 airports
What this shows ACK is marked in the 80-85% band.
Delay Cause Breakdown
Top delay cause: Late Aircraft. Total delay minutes: 178,866.
ACK - seasonal on-time pattern
Best: January (100%) · worst: July (87.1%)
Seasonal Performance Patterns
Monthly averages across all years of data. Best month: January (100% on-time). Most delays: July (87.1% on-time).
| Month | Avg Flights | Avg Delayed | Avg Cancelled | On-Time % |
|---|---|---|---|---|
| December | 24 | 6 | 1 | 91.7% |
| November | 22 | 2 | 0 | 95.5% |
| October | 172 | 31 | 4 | 90.9% |
| September | 378 | 66 | 6 | 90.6% |
| August | 783 | 134 | 16 | 91% |
| July | 814 | 194 | 28 | 87.1% |
| June | 541 | 105 | 15 | 89.5% |
| May | 182 | 28 | 3 | 91.9% |
| January | 4 | 0 | 0 | 100% |
Year-Over-Year Performance
Annual flight volume and on-time trends at ACK.
ACK - on-time rate by year
2020–2025, year-over-year trend.
| Year | Flights | Delayed | Cancelled | On-Time % |
|---|---|---|---|---|
| 2025 | 3,164 | 348 | 73 | 89% |
| 2024 | 3,350 | 321 | 92 | 90.4% |
| 2023 | 3,232 | 388 | 95 | 88% |
| 2022 | 3,390 | 325 | 69 | 90.4% |
| 2021 | 3,078 | 360 | 88 | 88.3% |
| 2020 | 866 | 35 | 9 | 96% |
Cancellation & Diversion Analysis
Flight disruption statistics for Nantucket, MA.
Cancellation Rate
2.49%
426 of 17,080 flights
Diversion Rate
0.13%
22 of 17,080 flights
Delay Rate
19.5%
3,324 of 17,080 flights
Monthly Performance
Recent 24 months of flight data.
| Period | Flights | Dep Delayed | Arr Delayed | Cancelled | Diverted |
|---|---|---|---|---|---|
| Oct 2025 | 142 | 21 | 15 | 3 | 0 |
| Sep 2025 | 354 | 45 | 30 | 2 | 1 |
| Aug 2025 | 962 | 71 | 55 | 6 | 0 |
| Jul 2025 | 992 | 126 | 97 | 40 | 2 |
| Jun 2025 | 600 | 73 | 53 | 22 | 0 |
| May 2025 | 114 | 12 | 7 | 0 | 0 |
| Oct 2024 | 148 | 7 | 4 | 0 | 0 |
| Sep 2024 | 350 | 20 | 12 | 1 | 0 |
| Aug 2024 | 948 | 84 | 88 | 42 | 0 |
| Jul 2024 | 958 | 115 | 94 | 26 | 1 |
| Jun 2024 | 692 | 70 | 59 | 17 | 0 |
| May 2024 | 254 | 25 | 21 | 6 | 1 |
| Oct 2023 | 200 | 21 | 26 | 2 | 0 |
| Sep 2023 | 462 | 50 | 51 | 22 | 0 |
| Aug 2023 | 812 | 81 | 83 | 4 | 0 |
| Jul 2023 | 872 | 131 | 117 | 43 | 3 |
| Jun 2023 | 686 | 94 | 81 | 24 | 1 |
| May 2023 | 200 | 11 | 13 | 0 | 0 |
| Oct 2022 | 332 | 29 | 30 | 14 | 1 |
| Sep 2022 | 526 | 45 | 42 | 4 | 0 |
| Aug 2022 | 872 | 80 | 67 | 15 | 0 |
| Jul 2022 | 888 | 98 | 87 | 17 | 4 |
| Jun 2022 | 642 | 60 | 57 | 14 | 1 |
| May 2022 | 130 | 13 | 14 | 5 | 0 |
Top Routes from ACK
Busiest routes to and from Nantucket, MA.
| Route | Flights | On-Time | Distance |
|---|---|---|---|
| ACK (Nantucket) → JFK (New York) | 2,109 | 76.2% | 199 mi |
| JFK (New York) → ACK (Nantucket) | 2,109 | 79.9% | 199 mi |
| ACK (Nantucket) → LGA (New York) | 1,973 | 77.4% | 202 mi |
| LGA (New York) → ACK (Nantucket) | 1,973 | 83.2% | 202 mi |
| ACK (Nantucket) → DCA (Washington) | 1,353 | 79.7% | 405 mi |
| DCA (Washington) → ACK (Nantucket) | 1,353 | 82.6% | 405 mi |
| BOS (Boston) → ACK (Nantucket) | 895 | 80.4% | 91 mi |
| ACK (Nantucket) → BOS (Boston) | 894 | 75.7% | 91 mi |
| ACK (Nantucket) → HPN (White Plains) | 624 | 84.1% | 191 mi |
| HPN (White Plains) → ACK (Nantucket) | 624 | 86.4% | 191 mi |
Airports With a Similar On-Time Rate
Other U.S. airports nationwide whose on-time rate is closest to Nantucket, MA's 80.5%.
Other Airports in Massachusetts
Compare performance with other Massachusetts airports.
Keep exploring
More flight data around Nantucket, MA.
Massachusetts flight data
Statewide on-time and delay aggregates, plus every reporting airport in Massachusetts.
View MA data →Airport rankings
See where ACK sits among U.S. airports on on-time rate and average delay.
Best on-time airports →Compare airports
Put ACK head-to-head with another airport on delays and reliability.
Open comparison tool →What the Data Says About ACK
Nantucket, MA in Nantucket, Massachusetts handled 17,080 flights in the Bureau of Transportation Statistics dataset between 2020 and 2025, posting a 80.5% on-time departure rate. Of those flights, 3,324 experienced delays, 426 were cancelled, and 22 were diverted. The cancellation rate works out to 2.49%, the diversion rate to 0.13%, and the average delay when departures run late is 91.1 minutes. These figures are the baseline for comparing ACK against other airports in the same state and nationally.
Breaking down what drives delays at ACK, Late Aircraft leads the pack. Late Aircraft accounts for 47.9% of total delay minutes, followed by NAS (National Aviation System) at 26.9% and Carrier at 22.1%. Weather contributes 2.9% of delay minutes at this airport, while security holds the smallest share at 0.2%. Travelers often overestimate the weather share; the BTS categorization shows late-arriving aircraft and carrier operations as the larger contributors.
Seasonally, January runs the cleanest at ACK with a 100% on-time rate, while July is the roughest at 87.1% - a 13-point swing between best and worst month. Volume peaks in July, when average flights hit 814. The busiest route connecting ACK is to JFK (New York), with 2,109 flights at a 76.2% on-time rate. Combine these numbers - 80.5% on-time, 91.1-minute average delay, 2.49% cancellation rate, and you have a concrete picture of departure reliability at Nantucket, MA.
Frequently Asked Questions
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Flight Guides
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Using ACK's data
An airport-level on-time rate is a starting point, not a guarantee for your specific flight.
- Check the busiest route from ACK before you book a connection. See top routes
- Travel in January rather than July if your dates are flexible. Seasonal patterns
- Scores vary by airline and route within the same airport; check the specific carrier you're flying. Browse airlines
On-time rate reflects the BTS historical average across all reporting carriers at this airport, not any single flight or airline.
Related
Source: U.S. Bureau of Transportation Statistics (BTS) Airline on-time performance and operational reliability · 2025
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. Airport figures are computed directly from BTS On-Time Performance data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.