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

Nantucket, MA (ACK) to Boston, MA (BOS) flight delay odds

70.8% of 253 official scheduled ACK-to-BOS flights arrived on time; 24.1% arrived at least 30 minutes late and 0.4% 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 SIGNALGenerally reliable
70.8%arrived on time
24.1%30+ min late
0.4%cancelled
253scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late17.0%all scheduled flights
120+ minutes late5.9%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+14.6 mincompleted flights

Which departure time was most reliable for ACK to BOS?

Among qualifying ACK-to-BOS departure window results, Late morning had the highest on-time rate: 92.2% of 51 flights. Evening was lowest at 62.4% across 125 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning5192.2%7.8%0.0%
Afternoon7770.1%26.0%0.0%
Evening12562.4%29.6%0.8%

Which weekday was most reliable for ACK to BOS?

Among qualifying ACK-to-BOS weekday results, Saturday had the highest on-time rate: 86.1% of 36 flights. Monday was lowest at 59.5% across 37 flights.

DayFlightsOn time30+ minCancelled
Monday3759.5%35.1%2.7%
Tuesday3873.7%23.7%0.0%
Wednesday3171.0%16.1%0.0%
Thursday3871.1%23.7%0.0%
Friday3672.2%25.0%0.0%
Saturday3686.1%11.1%0.0%
Sunday3762.2%32.4%0.0%

Which airline was most reliable for ACK to BOS?

Only JetBlue Airways met the ACK-to-BOS airline threshold: 69.6% of 240 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
JetBlue Airways24069.6%25.0%0.4%
Republic Airways1392.3%7.7%0.0%

Which month was most reliable for ACK to BOS?

Among qualifying ACK-to-BOS month results, August 2025 had the highest on-time rate: 85.5% of 62 flights. September 2025 was lowest at 37.5% across 32 flights.

MonthFlightsOn time30+ minCancelled
July 20256262.9%32.3%1.6%
August 20256285.5%8.1%0.0%
September 20253237.5%53.1%0.0%
October 20251957.9%31.6%0.0%
June 20266581.5%16.9%0.0%

What drove ACK to BOS delay minutes?

National airspace was the largest recorded ACK-to-BOS delay category, accounting for 55.8% of 6,147 BTS-attributed delay minutes during July 2025–June 2026.

Airline6.4%
Late aircraft37.8%
National airspace55.8%
Weather0.0%
Security0.1%
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.