BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
ACKJFK

Nantucket, MA (ACK) to New York, NY (JFK) flight delay odds

Historically, 65.9% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 308 flights.

HISTORICAL ROUTE SIGNALHigher disruption
65.9%arrived on time
22.1%30+ min late
4.5%cancelled
308scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late16.9%all scheduled flights
120+ minutes late6.8%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+23.1 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Afternoon30865.9%22.1%4.5%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday4656.5%23.9%6.5%
Tuesday4072.5%25.0%2.5%
Wednesday3770.3%10.8%10.8%
Thursday4650.0%32.6%8.7%
Friday4780.9%8.5%2.1%
Saturday4678.3%15.2%0.0%
Sunday4654.3%37.0%2.2%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
JetBlue Airways19868.7%20.7%4.0%
Republic Airways11060.9%24.5%5.5%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 20259351.6%30.1%9.7%
August 20258577.6%12.9%1.2%
September 20253976.9%17.9%0.0%
October 20251376.9%15.4%0.0%
May 20261361.5%23.1%0.0%
June 20266563.1%26.2%6.2%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline26.9%
Late aircraft20.1%
National airspace50.5%
Weather2.5%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.