Long Island MacArthur in July 2025

67.2%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 July 2025, reporting carriers scheduled 463 domestic departures from Long Island MacArthur (ISP). 67.2% left less than 15 minutes late and 67.8% reached their destination on time; 1.3% were cancelled.

Nationally that month, 69.7% of flights departed on time and 69.0% arrived on time, so ISP departures were 2.5 points below the national departure figure.

A year earlier, in July 2024, the airport had 407 departures with 65.4% leaving on time: a change of +1.8 points, with flights up 14%.

Flights arriving at ISP that month were on time 63.1% of the time (463 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 36%, national aviation system 33% and air carrier 26%.

On time 67.8%
Arrived 15+ minutes late 29.4%
Cancelled 1.3%
Diverted 1.5%

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

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

Measure	Jul 2025	Jul 2024	ISP, 12 months to Jul 2026	All reported flights, Jul 2025
Departed on time	67.2%	65.4%	73.7%	69.7%
Arrived on time	67.8%	72.5%	73.6%	69.0%
Cancelled	1.3%	3.9%	2.1%	2.5%
Average departure delay (late minutes only)	29.6 min	22.2 min	18.8 min	24.3 min
Scheduled departures a day	15	14	14	21,048
Scheduled departures	463	407	4,966	631,428

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	289	62%	70.9%	16.9 min	2.1%
B6 JetBlue Airways	93	20%	60.2%	25.3 min	0.0%
F9 Frontier Airlines	81	17%	65.4%	32.8 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–BWI	Islip to Baltimore	128	71.1%	18.5 min	2.3%
ISP–MCO	Islip to Orlando	124	62.9%	31.6 min	0.8%
ISP–PBI	Islip to West Palm Beach/Palm Beach	94	68.1%	18.3 min	2.1%
ISP–TPA	Islip to Tampa	39	61.5%	30.9 min	0.0%
ISP–FLL	Islip to Fort Lauderdale	31	67.7%	5.5 min	0.0%
ISP–MIA	Islip to Miami	30	73.3%	21.8 min	0.0%
ISP–MYR	Islip to Myrtle Beach	17	82.4%	-10.3 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), July 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2025	Minutes
Air carrier	25.7%	31.1%	3,312
Late-arriving aircraft	36.4%	40.8%	4,699
National Aviation System	32.5%	20.7%	4,196
Extreme weather	5.3%	7.3%	686
Security	0.0%	0.1%	0

12,893 delay minutes on 136 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 2025?

67.2% of 463 scheduled domestic departures left less than 15 minutes late, and 67.8% reached their destination on time. The national figures that month were 69.7% and 69.0%.

How does that compare with a year earlier?

In July 2024, 65.4% of 407 departures left on time and 3.9% were cancelled, against 67.2% and 1.3% in July 2025.

Provenance

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