Long Island MacArthur in August 2025

72.2%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 August 2025, reporting carriers scheduled 403 domestic departures from Long Island MacArthur (ISP). 72.2% left less than 15 minutes late and 71.2% reached their destination on time; 0.2% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so ISP departures were 4.6 points below the national departure figure.

A year earlier, in August 2024, the airport had 378 departures with 67.2% leaving on time: a change of +5.0 points, with flights up 7%.

Flights arriving at ISP that month were on time 73.9% of the time (403 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 49%, national aviation system 27% and air carrier 24%.

On time 71.2%
Arrived 15+ minutes late 27.8%
Cancelled 0.2%
Diverted 0.7%

Every scheduled departure from ISP in August 2025, judged by arrival at the destination.

August 2025 against a year earlier, the airport's year and the nation

Measure	Aug 2025	Aug 2024	ISP, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	72.2%	67.2%	73.7%	76.8%
Arrived on time	71.2%	64.3%	73.6%	76.3%
Cancelled	0.2%	3.2%	2.1%	1.1%
Average departure delay (late minutes only)	22.8 min	26.9 min	18.8 min	17.6 min
Scheduled departures a day	13	13	14	20,079
Scheduled departures	403	378	4,966	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	223	55%	75.8%	11.5 min	0.0%
B6 JetBlue Airways	93	23%	66.7%	20.8 min	0.0%
F9 Frontier Airlines	87	22%	64.4%	26.7 min	1.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–MCO	Islip to Orlando	125	59.2%	31.0 min	0.8%
ISP–BWI	Islip to Baltimore	97	80.4%	10.4 min	0.0%
ISP–PBI	Islip to West Palm Beach/Palm Beach	88	73.9%	12.3 min	0.0%
ISP–TPA	Islip to Tampa	42	76.2%	9.2 min	0.0%
ISP–FLL	Islip to Fort Lauderdale	31	74.2%	7.5 min	0.0%
ISP–MYR	Islip to Myrtle Beach	16	81.3%	8.8 min	0.0%
ISP–MIA	Islip to Miami	4	50.0%	33.5 min	0.0%

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), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	23.7%	33.1%	1,957
Late-arriving aircraft	48.9%	40.5%	4,036
National Aviation System	27.4%	19.2%	2,266
Extreme weather	0.0%	7.0%	0
Security	0.0%	0.1%	0

8,259 delay minutes on 112 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 August 2025?

72.2% of 403 scheduled domestic departures left less than 15 minutes late, and 71.2% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 67.2% of 378 departures left on time and 3.2% were cancelled, against 72.2% and 0.2% in August 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2025; 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.