Nantucket Memorial in July 2026

62.6%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 July 2026, reporting carriers scheduled 546 domestic departures from Nantucket Memorial (ACK). 62.6% left less than 15 minutes late and 58.2% reached their destination on time; 12.6% were cancelled.

Nationally that month, 68.8% of flights departed on time and 69.4% arrived on time, so ACK departures were 6.2 points below the national departure figure.

A year earlier, in July 2025, the airport had 496 departures with 66.9% leaving on time: a change of −4.3 points, with flights up 10%.

Flights arriving at ACK that month were on time 66.1% of the time (546 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 39%, national aviation system 37% and air carrier 14%.

On time 58.2%
Arrived 15+ minutes late 28.8%
Cancelled 12.6%
Diverted 0.4%

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

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

Measure	Jul 2026	Jul 2025	ACK, 12 months to Jul 2026	All reported flights, Jul 2026
Departed on time	62.6%	66.9%	73.0%	68.8%
Arrived on time	58.2%	59.7%	69.6%	69.4%
Cancelled	12.6%	8.1%	5.3%	2.6%
Average departure delay (late minutes only)	33.9 min	31.5 min	20.9 min	24.1 min
Scheduled departures a day	18	17	5	21,066
Scheduled departures	546	496	1,690	631,970

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
YX Republic Airline	294	54%	63.9%	20.4 min	9.5%
B6 JetBlue Airways	232	42%	50.9%	35.9 min	17.2%
MQ Envoy Air	12	2%	66.7%	116.0 min	0.0%
OO SkyWest Airlines	8	1%	50.0%	3.0 min	12.5%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ACK–LGA	Nantucket to New York	125	60.0%	34.3 min	12.0%
ACK–DCA	Nantucket to Washington	94	50.0%	36.1 min	9.6%
ACK–BOS	Nantucket to Boston	93	61.3%	10.3 min	9.7%
ACK–JFK	Nantucket to New York	86	50.0%	17.4 min	25.6%
ACK–HPN	Nantucket to White Plains	62	54.8%	49.8 min	14.5%
ACK–PHL	Nantucket to Philadelphia	62	75.8%	10.9 min	6.5%
ACK–CLT	Nantucket to Charlotte	12	66.7%	116.0 min	0.0%
ACK–ORD	Nantucket to Chicago	12	58.3%	25.3 min	8.3%

By scheduled departure hour

100

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

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

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2026	Minutes
Air carrier	14.3%	31.7%	2,470
Late-arriving aircraft	38.5%	41.8%	6,645
National Aviation System	37.0%	19.9%	6,378
Extreme weather	9.8%	6.5%	1,689
Security	0.3%	0.1%	56

17,238 delay minutes on 157 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 July 2026?

62.6% of 546 scheduled domestic departures left less than 15 minutes late, and 58.2% reached their destination on time. The national figures that month were 68.8% and 69.4%.

How does that compare with a year earlier?

In July 2025, 66.9% of 496 departures left on time and 8.1% were cancelled, against 62.6% and 12.6% in July 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for July 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.