Airports › Massachusetts
Airport · 12 months to July 2026
Nantucket Memorial: delays and on-time record
Nantucket, Massachusetts
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report. Data through July 2026; this is a monthly history, not live airport status.
Nantucket Memorial (ACK) in Nantucket, Massachusetts had 1,690 scheduled domestic departures by reporting carriers in the 12 months to July 2026, about 5 a day, on 8 routes.
73.0% of those flights left the gate less than 15 minutes late, 3.1 points below the national departure figure of 76.1%. Flights arriving at ACK were on time 77.5% of the time, 1.5 points above the national arrival figure of 76.0%.
5.3% of scheduled departures were cancelled (national: 1.8%), and the average departure delay, counting early and on-time departures as zero, was 20.9 min.
JetBlue Airways is the largest reporting carrier at ACK with 52% of departures. Among carriers with at least 120 departures, JetBlue Airways had the highest on-time arrival share for its ACK departures (70.8%) and Republic Airline the lowest (69.0%).
On-time departures are about level with the previous 12 months (73.4%).
Of the delay minutes that carriers assigned to a BTS cause category for flights leaving ACK, national aviation system 40%, late-arriving aircraft 39% and air carrier 15%.
- On time 69.6%
- Arrived 15+ minutes late 24.9%
- Cancelled 5.3%
- Diverted 0.2%
As origin and as destination, against the nation
| Measure | Departures from ACK | Arrivals at ACK | All reported flights | ACK departures, previous 12 months |
|---|---|---|---|---|
| Departed on time (less than 15 min late) | 73.0% | 80.6% | 76.1% | 73.4% |
| Arrived on time | 69.6% | 77.5% | 76.0% | 67.8% |
| Cancelled | 5.3% | 3.8% | 1.8% | 6.7% |
| Diverted | 0.2% | 0.6% | 0.3% | 0.1% |
| Average departure delay (late minutes only) | 20.9 min | 12.0 min | 17.4 min | 23.3 min |
| Arrival delay minutes per 100 flights | 2,198 | 1,196 | 1,684 | 2,444 |
| Scheduled flights | 1,690 | 1,690 | 7,043,858 | 1,576 |
12 months to July 2026. The first column follows flights that left ACK; the second follows flights that landed there. Year on year, on-time departures moved −0.4 pts.
Airlines at ACK
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| B6 JetBlue Airways | 877 | 52% | 70.8% | 13.2 min | 5.2% |
| YX Republic Airline | 770 | 46% | 69.0% | 13.3 min | 5.5% |
Departures from ACK by reporting carrier, ordered by flights; on time means the flight reached its destination less than 15 minutes late. Green is at or above the airport's overall share of 69.6%. Carriers fly different routes at different hours, so the rows are not a like-for-like test.
Busiest routes from ACK
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| ACK–LGA | Nantucket to New York | 412 | 71.8% | 13.7 min | 5.8% |
| ACK–JFK | Nantucket to New York | 301 | 65.8% | 12.0 min | 9.0% |
| ACK–BOS | Nantucket to Boston | 284 | 69.4% | 10.9 min | 3.2% |
| ACK–DCA | Nantucket to Washington | 283 | 68.6% | 14.6 min | 4.2% |
| ACK–HPN | Nantucket to White Plains | 234 | 74.4% | 14.0 min | 4.7% |
| ACK–PHL | Nantucket to Philadelphia | 122 | 68.9% | 12.4 min | 4.1% |
| ACK–ORD | Nantucket to Chicago | 31 | 61.3% | 23.7 min | 6.5% |
| ACK–CLT | Nantucket to Charlotte | 23 | 65.2% | 68.0 min | 0.0% |
Routes with at least 10 flights a month have their own page.
Month by month
By scheduled departure hour
Among hours with at least 34 departures, 10 am to 11 am had the highest on-time share (83.2% of 167 flights) and 5 pm to 6 pm the lowest (58.2% of 165).
Delay causes
Cancellations by reported reason (90 in the period): air carrier 26%, weather 33%, national aviation system 41%, security 0%.
Checkpoint volumes
TSA publishes daily checkpoint passenger counts for the country as a whole, not for ACK on its own. The national series through September 2026 is on the checkpoint volumes page.
Questions and answers
How often do flights leave ACK on time?
73.0% of the 1,690 scheduled domestic departures in the 12 months to July 2026 left less than 15 minutes late; the national figure was 76.1%. 5.3% were cancelled.
How often do flights arrive at ACK on time?
77.5% of 1,690 scheduled arrivals were on time by the BTS definition, against 76.0% nationally.
Which airline has the highest on-time share at ACK?
Counting departures from ACK and whether they reached their destination on time, JetBlue Airways had the highest share (70.8% of 877 flights), then Republic Airline (69.0%). Carriers fly different routes at different hours, so the figures are not a like-for-like test.
What causes delays at ACK?
For departures from ACK that reached their destination 15 or more minutes late, carriers attributed the delay minutes as follows: national aviation system 40%, late-arriving aircraft 39%, air carrier 15%, extreme weather 5%, security 0%.
What time of day has the highest on-time share at ACK?
Departures scheduled from 10 am to 11 am local time left on time 83.2% of the time, the highest of any hour with enough flights to compare; 5 pm to 6 pm was lowest at 58.2%.
Is it getting better?
On-time departures for the 12 months to July 2026 were 73.0%, about level with the previous 12 months (73.4%). The monthly chart shows each of the last 36 months, and each month has its own page.
Does this page show today's delays at ACK?
No. BTS publishes on-time records about two months after the month ends, so this page is a monthly history through July 2026. For live conditions use the FAA airport status service or your airline.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026; airport name from the BTS airport lookup table. US government works in the public domain. Domestic scheduled flights by reporting carriers only: international flights, charters and smaller carriers are not in the source. Totals and averages only; no individual flight or aircraft is identified. See the methodology; report processing errors through corrections.