Nantucket Memorial in June 2026

74.4%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In June 2026, reporting carriers scheduled 356 domestic departures from Nantucket Memorial (ACK). 74.4% left less than 15 minutes late and 72.5% reached their destination on time; 2.8% were cancelled.

Nationally that month, 72.2% of flights departed on time and 72.8% arrived on time, so ACK departures were 2.2 points above the national departure figure.

A year earlier, in June 2025, the airport had 300 departures with 68.7% leaving on time: a change of +5.7 points, with flights up 19%.

Flights arriving at ACK that month were on time 79.2% of the time (356 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 46%, national aviation system 35% and air carrier 17%.

On time 72.5%
Arrived 15+ minutes late 24.7%
Cancelled 2.8%
Diverted 0.0%

Every scheduled departure from ACK in June 2026, judged by arrival at the destination.

June 2026 against a year earlier, the airport's year and the nation

Measure	Jun 2026	Jun 2025	ACK, 12 months to Jul 2026	All reported flights, Jun 2026
Departed on time	74.4%	68.7%	73.0%	72.2%
Arrived on time	72.5%	61.3%	69.6%	72.8%
Cancelled	2.8%	7.3%	5.3%	1.6%
Average departure delay (late minutes only)	19.7 min	26.0 min	20.9 min	20.6 min
Scheduled departures a day	12	10	5	20,253
Scheduled departures	356	300	1,690	607,577

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	184	52%	72.8%	7.1 min	4.3%
B6 JetBlue Airways	160	45%	71.9%	14.6 min	1.3%
MQ Envoy Air	6	2%	83.3%	-3.0 min	0.0%
OO SkyWest Airlines	6	2%	66.7%	3.8 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ACK–LGA	Nantucket to New York	91	69.2%	12.1 min	5.5%
ACK–BOS	Nantucket to Boston	65	81.5%	5.6 min	0.0%
ACK–JFK	Nantucket to New York	65	63.1%	12.7 min	6.2%
ACK–DCA	Nantucket to Washington	48	77.1%	15.5 min	2.1%
ACK–HPN	Nantucket to White Plains	47	68.1%	18.9 min	0.0%
ACK–PHL	Nantucket to Philadelphia	26	80.8%	-8.3 min	0.0%
ACK–ORD	Nantucket to Chicago	8	75.0%	1.0 min	0.0%
ACK–CLT	Nantucket to Charlotte	6	83.3%	-3.0 min	0.0%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), June 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Jun 2026	Minutes
Air carrier	16.6%	30.8%	1,192
Late-arriving aircraft	46.4%	42.1%	3,329
National Aviation System	34.6%	20.3%	2,485
Extreme weather	2.4%	6.7%	170
Security	0.1%	0.1%	4

7,180 delay minutes on 88 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left ACK on time in June 2026?

74.4% of 356 scheduled domestic departures left less than 15 minutes late, and 72.5% reached their destination on time. The national figures that month were 72.2% and 72.8%.

How does that compare with a year earlier?

In June 2025, 68.7% of 300 departures left on time and 7.3% were cancelled, against 74.4% and 2.8% in June 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for June 2026; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for ACK · methodology · corrections.