Long Island MacArthur in March 2025

76.6%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 March 2025, reporting carriers scheduled 482 domestic departures from Long Island MacArthur (ISP). 76.6% left less than 15 minutes late and 77.0% reached their destination on time; 1.9% were cancelled.

Nationally that month, 79.9% of flights departed on time and 79.3% arrived on time, so ISP departures were 3.3 points below the national departure figure.

A year earlier, in March 2024, the airport had 468 departures with 70.5% leaving on time: a change of +6.1 points, with flights up 3%.

Flights arriving at ISP that month were on time 73.9% of the time (483 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 44%, air carrier 26% and national aviation system 23%.

On time 77.0%
Arrived 15+ minutes late 21.0%
Cancelled 1.9%
Diverted 0.2%

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

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

Measure	Mar 2025	Mar 2024	ISP, 12 months to Jul 2026	All reported flights, Mar 2025
Departed on time	76.6%	70.5%	73.7%	79.9%
Arrived on time	77.0%	72.2%	73.6%	79.3%
Cancelled	1.9%	2.1%	2.1%	1.2%
Average departure delay (late minutes only)	18.9 min	21.2 min	18.8 min	14.9 min
Scheduled departures a day	16	16	14	20,029
Scheduled departures	482	468	4,966	600,872

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	276	57%	79.7%	6.2 min	1.8%
F9 Frontier Airlines	126	26%	73.0%	6.5 min	3.2%
B6 JetBlue Airways	80	17%	73.8%	0.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–MCO	Islip to Orlando	131	77.9%	3.3 min	0.8%
ISP–PBI	Islip to West Palm Beach/Palm Beach	128	80.5%	3.6 min	1.6%
ISP–BWI	Islip to Baltimore	89	85.4%	4.4 min	2.2%
ISP–TPA	Islip to Tampa	50	68.0%	6.7 min	4.0%
ISP–FLL	Islip to Fort Lauderdale	35	71.4%	-2.5 min	2.9%
ISP–MIA	Islip to Miami	31	67.7%	10.0 min	0.0%
ISP–RSW	Islip to Fort Myers	18	55.6%	39.9 min	5.6%

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), March 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Mar 2025	Minutes
Air carrier	25.8%	33.0%	2,163
Late-arriving aircraft	43.5%	39.2%	3,644
National Aviation System	22.8%	21.9%	1,912
Extreme weather	7.8%	5.9%	649
Security	0.0%	0.1%	0

8,368 delay minutes on 101 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 March 2025?

76.6% of 482 scheduled domestic departures left less than 15 minutes late, and 77.0% reached their destination on time. The national figures that month were 79.9% and 79.3%.

How does that compare with a year earlier?

In March 2024, 70.5% of 468 departures left on time and 2.1% were cancelled, against 76.6% and 1.9% in March 2025.

Provenance

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