Long Island MacArthur in April 2025

82.6%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 April 2025, reporting carriers scheduled 536 domestic departures from Long Island MacArthur (ISP). 82.6% left less than 15 minutes late and 82.6% reached their destination on time; 0.2% were cancelled.

Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so ISP departures were 2.0 points above the national departure figure.

A year earlier, in April 2024, the airport had 433 departures with 76.2% leaving on time: a change of +6.4 points, with flights up 24%.

Flights arriving at ISP that month were on time 81.0% of the time (537 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 45%, air carrier 41% and national aviation system 14%.

On time 82.6%
Arrived 15+ minutes late 17.0%
Cancelled 0.2%
Diverted 0.2%

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

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

Measure	Apr 2025	Apr 2024	ISP, 12 months to Jul 2026	All reported flights, Apr 2025
Departed on time	82.6%	76.2%	73.7%	80.6%
Arrived on time	82.6%	79.4%	73.6%	79.5%
Cancelled	0.2%	2.1%	2.1%	0.8%
Average departure delay (late minutes only)	13.5 min	20.4 min	18.8 min	14.1 min
Scheduled departures a day	18	14	14	19,465
Scheduled departures	536	433	4,966	583,950

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	296	55%	83.8%	2.1 min	0.0%
F9 Frontier Airlines	151	28%	80.8%	4.2 min	0.7%
B6 JetBlue Airways	89	17%	82.0%	-2.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–MCO	Islip to Orlando	149	79.2%	5.8 min	0.0%
ISP–PBI	Islip to West Palm Beach/Palm Beach	120	84.2%	3.4 min	0.0%
ISP–BWI	Islip to Baltimore	106	90.6%	-4.1 min	0.0%
ISP–TPA	Islip to Tampa	63	74.6%	-3.2 min	0.0%
ISP–FLL	Islip to Fort Lauderdale	47	85.1%	3.0 min	0.0%
ISP–MIA	Islip to Miami	30	73.3%	14.9 min	0.0%
ISP–RSW	Islip to Fort Myers	16	87.5%	-8.7 min	6.3%
ISP–MYR	Islip to Myrtle Beach	5	100.0%	-5.6 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), April 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2025	Minutes
Air carrier	40.5%	32.7%	2,604
Late-arriving aircraft	45.2%	39.4%	2,900
National Aviation System	14.3%	22.2%	919
Extreme weather	0.0%	5.5%	0
Security	0.0%	0.2%	0

6,423 delay minutes on 91 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 April 2025?

82.6% of 536 scheduled domestic departures left less than 15 minutes late, and 82.6% reached their destination on time. The national figures that month were 80.6% and 79.5%.

How does that compare with a year earlier?

In April 2024, 76.2% of 433 departures left on time and 2.1% were cancelled, against 82.6% and 0.2% in April 2025.

Provenance

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