Nantucket Memorial Airport (ACK)

The current estimate for the standard security lane at Nantucket Memorial Airport is 5–15 min (updated 1:33 PM EDT). It refreshes every 15 minutes; follow airport signs and staff if the line in front of you looks different.

The FAA reports no ground stops or ground delay programs at ACK as of 1:33 PM EDT. Individual flights can still be late, so check your airline's app.

The FAA reports no closure at ACK as of 1:33 PM EDT. For weather or security emergencies, check the official ACK website.

Today (Friday) ACK security is expected to be busiest 7 AM–9 AM (10–30 min) and quietest 12 PM–2 PM (5–15 min).

Security checkpoints at Nantucket Memorial Airport open before the first morning departures, which at most U.S. airports means around 4–5 AM (earlier at some large hubs). Hours differ by checkpoint and terminal, so for a very early flight confirm on the official ACK website.

Follow the Departures signs to the upper or departures-level curb for your airline. Curbside stopping is for active loading only; at peak hours (7 AM–9 AM) allow extra time for curb traffic. Cell-phone lots and parking rates are listed on the official ACK website.

PreCheck lanes usually run during the main morning-to-evening operating hours but can open later and close earlier than standard lanes, and not every checkpoint has one. Outside those hours PreCheck travelers are screened in the standard lane, so plan for the standard wait.

Airlines and TSA recommend 2 hours before a domestic flight and 3 hours before an international one. At the busiest hour today the ACK security line alone can reach 30 minutes; use the calculator on this page for your flight time.

They are modeled estimates refreshed every 15 minutes, not a camera or sensor count at the checkpoint. They combine FAA passenger volume, TSA's daily national screening numbers, the hour, weekday, holiday periods and current FAA and weather conditions.