How reliable is Nantucket Memorial Airport?
Flights from ACK departed within 15 minutes of schedule in 78% of 10,296 flights in official BTS history — and weather is calmest in Nov. Here’s the full picture before you book.
Reliability score
on-time, cancellations & delays
Weather favorability
year-round climate
Origin-airport operations
What the departure punctuality at ACK looks like
On-time departures
across 10,296 flights
Source: BTS Airport Operations · data through 2026-06-25. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
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Weather by month
When the weather works for you at Nantucket
A calm-weather score (0–100) for each month from decades of airport observations — how often conditions disrupt flying, not temperature. Higher is calmer.
Calmest month
Calmest flying weather of the year · 90/100 favorability
Roughest month
Most disruptive — low visibility & fog, thunderstorms · 64/100 favorability
The read on ACK
What the numbers say about flying through Nantucket Memorial Airport
Across official performance history, flights from Nantucket left within 15 minutes of schedule about 78% of the time over 10,296 flights. That's a respectable but unspectacular operational record. Pair it with an elevated cancellation rate of 5.5% — worth weighing alongside the on-time figure. When a departure does run late, the typical delay is around 17 minutes.
On weather, Nantucket is a generally calm-weather airport, with a rougher stretch to watch. November is the calmest stretch for flying, scoring 90 out of 100 for favorable conditions, while July is the most disruptive at 64, driven mainly by low visibility & fog and thunderstorms. The seasonal swing is real but manageable; favor the calmer months when your dates are flexible.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Nantucket, read how we weigh it all in how the PlaneSane Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about ACK
- How reliable is Nantucket Memorial Airport (ACK)?
- Flights from Nantucket left within 15 minutes of schedule roughly 78% of the time across 10,296 flights of official history — a respectable but unspectacular operational record. The cancellation rate runs about 5.5%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from ACK for good weather?
- November has the calmest flying weather at Nantucket Memorial Airport. July is the most disruptive, mainly from low visibility & fog and thunderstorms.
Planning a trip through Nantucket?
Score real flights to and from ACK on reliability, weather, and connection safety — not just price.