Long Island MacArthur in July 2026

66.4%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 July 2026, reporting carriers scheduled 443 domestic departures from Long Island MacArthur (ISP). 66.4% left less than 15 minutes late and 70.2% reached their destination on time; 2.7% were cancelled.

Nationally that month, 68.8% of flights departed on time and 69.4% arrived on time, so ISP departures were 2.4 points below the national departure figure.

A year earlier, in July 2025, the airport had 463 departures with 67.2% leaving on time: a change of −0.8 points, with flights down 4%.

Flights arriving at ISP that month were on time 68.2% of the time (444 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, extreme weather 39%, late-arriving aircraft 34% and national aviation system 15%.

On time 70.2%
Arrived 15+ minutes late 26.2%
Cancelled 2.7%
Diverted 0.9%

Every scheduled departure from ISP 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	ISP, 12 months to Jul 2026	All reported flights, Jul 2026
Departed on time	66.4%	67.2%	73.7%	68.8%
Arrived on time	70.2%	67.8%	73.6%	69.4%
Cancelled	2.7%	1.3%	2.1%	2.6%
Average departure delay (late minutes only)	29.5 min	29.6 min	18.8 min	24.1 min
Scheduled departures a day	15	15	14	21,066
Scheduled departures	443	463	4,966	631,970

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	236	53%	70.3%	15.5 min	3.0%
B6 JetBlue Airways	154	35%	70.1%	24.1 min	1.3%
F9 Frontier Airlines	53	12%	69.8%	8.3 min	5.7%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–BWI	Islip to Baltimore	146	71.2%	18.0 min	2.7%
ISP–MCO	Islip to Orlando	120	68.3%	15.8 min	1.7%
ISP–PBI	Islip to West Palm Beach/Palm Beach	92	73.9%	20.6 min	2.2%
ISP–FLL	Islip to Fort Lauderdale	44	72.7%	15.3 min	0.0%
ISP–TPA	Islip to Tampa	24	66.7%	19.8 min	4.2%
ISP–MYR	Islip to Myrtle Beach	17	52.9%	14.4 min	17.6%

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	12.7%	31.7%	1,368
Late-arriving aircraft	33.9%	41.8%	3,660
National Aviation System	14.8%	19.9%	1,598
Extreme weather	38.6%	6.5%	4,157
Security	0.0%	0.1%	0

10,783 delay minutes on 116 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 ISP on time in July 2026?

66.4% of 443 scheduled domestic departures left less than 15 minutes late, and 70.2% 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, 67.2% of 463 departures left on time and 1.3% were cancelled, against 66.4% and 2.7% 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 ISP · methodology · corrections.