BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
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JFK→ACK

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

78.2% of 308 official scheduled JFK-to-ACK flights arrived on time; 11.7% arrived at least 30 minutes late and 2.9% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALVariable
78.2%arrived on time
11.7%30+ min late
2.9%cancelled
308scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.2%all scheduled flights
120+ minutes late1.6%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival-4.0 mincompleted flights

Which departure time was most reliable for JFK to ACK?

Among qualifying JFK-to-ACK departure window results, Late morning had the highest on-time rate: 82.5% of 114 flights. Afternoon was lowest at 75.8% across 194 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning11482.5%10.5%1.8%
Afternoon19475.8%12.4%3.6%

Which weekday was most reliable for JFK to ACK?

Among qualifying JFK-to-ACK weekday results, Saturday had the highest on-time rate: 89.1% of 46 flights. Sunday was lowest at 67.4% across 46 flights.

DayFlightsOn time30+ minCancelled
Monday4669.6%23.9%2.2%
Tuesday4082.5%10.0%2.5%
Wednesday3781.1%8.1%5.4%
Thursday4671.7%6.5%8.7%
Friday4787.2%6.4%0.0%
Saturday4689.1%6.5%0.0%
Sunday4667.4%19.6%2.2%

Which airline was most reliable for JFK to ACK?

Among qualifying JFK-to-ACK airline results, Republic Airways had the highest on-time rate: 84.5% of 110 flights. JetBlue Airways was lowest at 74.7% across 198 flights.

AirlineFlightsOn time30+ minCancelled
JetBlue Airways19874.7%12.1%3.5%
Republic Airways11084.5%10.9%1.8%

Which month was most reliable for JFK to ACK?

Among qualifying JFK-to-ACK month results, August 2025 had the highest on-time rate: 90.6% of 85 flights. July 2025 was lowest at 69.9% across 93 flights.

MonthFlightsOn time30+ minCancelled
July 20259369.9%11.8%7.5%
August 20258590.6%7.1%0.0%
September 20253984.6%12.8%0.0%
June 20266573.8%9.2%3.1%

What drove JFK to ACK delay minutes?

Late aircraft was the largest recorded JFK-to-ACK delay category, accounting for 46.0% of 3,386 BTS-attributed delay minutes during July 2025–June 2026.

Airline26.5%
Late aircraft46.0%
National airspace24.3%
Weather3.2%
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.