OnTimeRoutes
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Nantucket Memorial Airport (ACK) delays & on-time performance

Nantucket, Massachusetts · 8 nonstop destinations · 4 airlines · Aug 2025 – Jul 2026

Live status todayFAA update Oct 11, 4:56 AM EDTAll US airport delays now →

No FAA-reported ground stops or delays at ACK right now. Individual flights can still be delayed by the airline; check with your airline for your flight.

On-time arrivals
74%
arrived < 15 min late
Cancelled
5.3%
90 flights
Avg arrival delay
23 min
85 min when late
Departed on time
77%
avg taxi-out 20 min

Figures cover 1,690 departures from ACK; on-time is measured at arrival. Arrivals into ACK were on time 81% of the time.

Key facts

  • Flights departing Nantucket Memorial Airport (ACK) arrived on time 74% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
  • 5.3% were cancelled, and 12% arrived an hour or more late.
  • JetBlue was the most punctual airline here (75% on time); Republic Airways was the least (73%).
  • Departures scheduled around 10am did best (81% on time); around 5pm did worst (61%).
  • The largest source of delay minutes was air traffic control & airport congestion (40%).

Most delayed routes from ACK

Lowest on-time arrival rates among regularly flown routes.

All 8 routes from ACK →

Most reliable routes from ACK

Highest on-time arrival rates among regularly flown routes.

Best airline at ACK

Departures from this airport, ranked by on-time arrival.

AirlineOn timeCancelledAvg delayRoutesFlights
JetBlue75%5.2%23 min5877
Republic Airways73%5.5%23 min6770
Envoy Air65%0.0%75 min123
SkyWest Airlines56%10.0%17 min120

Best time to fly out of ACK

On-time arrival rate by scheduled departure hour (local time).

  • 10am81%167 flts
  • 11am81%173 flts
  • 12pm78%294 flts
  • 1pm77%130 flts
  • 2pm80%129 flts
  • 3pm70%228 flts
  • 4pm67%273 flts
  • 5pm61%165 flts
  • 6pm69%120 flts

Monthly trend

50%75%100%July 2025: 65.2% on time, 8.1% cancelledJul ’25August 2025: 81.7% on time, 1.2% cancelledAug ’25September 2025: 69.5% on time, 1.1% cancelledSep ’25October 2025: 73.5% on time, 4.2% cancelledOct ’25May 2026: 71.2% on time, 0.0% cancelledMay ’26June 2026: 74.6% on time, 2.8% cancelledJun ’26July 2026: 66.9% on time, 12.6% cancelledJul ’26
On-time arrival rate by month. Hover a bar for exact figures.

Why departures were late

  • Air traffic control & airport congestion40%
  • Late-arriving aircraft39%
  • Airline (crew, maintenance, cleaning, fueling)15%
  • Extreme weather5%
  • Security0%

Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.