JFK to ACK flight delays
New York, NY (JFK) Nantucket, MA (ACK) · 199 miles
308 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
80.87%
Arrived on time
Within 15 minutes of schedule
2.92%
Cancelled
Share of scheduled flights
59 min
When late, late by
Average across delayed arrivals
12 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The cancellation rate for the period is 2.92%, but almost all of it belongs to one month: July 2025, when 7.53% of flights on this route did not operate. Outside that month the route cancelled at around 1.06%. Whatever happened in July was an event, not the normal state of this route.
Which airline you fly changes the odds here. Republic Airways arrived on time 9.4 points more often than JetBlue Airways over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The two directions do not behave alike. ACK to JFK arrives on time 11.8 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
This is a thin route — 308 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Which airline should you fly on this route?
Over January 2025 – August 2026, Republic Airways arrived on time most often on JFK to ACK. JetBlue Airways was late most often. Flights ran closest to schedule in August and worst in October.
Every airline on JFK to ACK
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 198 | 77.49% | 3.54% | 55 min | D |
| Republic Airways | 110 | 86.92% | 1.82% | 72 min | B |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
ACK to JFK Nantucket back to New York 69.05% on time FOther routes from New York
Common questions
Are flights from New York to Nantucket usually delayed?
80.87% of flights on the JFK to ACK route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is better than the average route in this record.
Which airline is most on time from New York to Nantucket?
Republic Airways, at 86.92% on time across 110 flights. The least punctual on the route was JetBlue Airways at 77.49%.
How often are JFK to ACK flights cancelled?
2.92% of scheduled flights did not operate — about 29 in every thousand. That is high enough that cancellation, not delay, is the risk worth planning around.
When JFK to ACK flights are late, how late are they?
About 59 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on JFK to ACK during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →