Long Island MacArthur in March 2026

64.6%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 2026, reporting carriers scheduled 413 domestic departures from Long Island MacArthur (ISP). 64.6% left less than 15 minutes late and 68.0% reached their destination on time; 3.9% were cancelled.

Nationally that month, 72.8% of flights departed on time and 73.2% arrived on time, so ISP departures were 8.2 points below the national departure figure.

A year earlier, in March 2025, the airport had 482 departures with 76.6% leaving on time: a change of −12.0 points, with flights down 14%.

Flights arriving at ISP that month were on time 61.1% of the time (414 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 61%, air carrier 22% and national aviation system 17%.

On time 68.0%
Arrived 15+ minutes late 27.6%
Cancelled 3.9%
Diverted 0.5%

Every scheduled departure from ISP in March 2026, judged by arrival at the destination.

March 2026 against a year earlier, the airport's year and the nation

Measure	Mar 2026	Mar 2025	ISP, 12 months to Jul 2026	All reported flights, Mar 2026
Departed on time	64.6%	76.6%	73.7%	72.8%
Arrived on time	68.0%	77.0%	73.6%	73.2%
Cancelled	3.9%	1.9%	2.1%	2.9%
Average departure delay (late minutes only)	21.7 min	18.9 min	18.8 min	20.3 min
Scheduled departures a day	14	16	14	20,403
Scheduled departures	413	482	4,966	612,102

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	195	47%	66.2%	10.7 min	3.6%
B6 JetBlue Airways	177	43%	70.1%	14.5 min	4.0%
F9 Frontier Airlines	41	10%	68.3%	6.9 min	4.9%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–MCO	Islip to Orlando	112	67.9%	11.2 min	5.4%
ISP–PBI	Islip to West Palm Beach/Palm Beach	98	64.3%	21.4 min	3.1%
ISP–BWI	Islip to Baltimore	90	73.3%	3.8 min	3.3%
ISP–FLL	Islip to Fort Lauderdale	45	57.8%	18.2 min	4.4%
ISP–TPA	Islip to Tampa	43	67.4%	6.5 min	4.7%
ISP–RSW	Islip to Fort Myers	25	84.0%	6.3 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), March 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Mar 2026	Minutes
Air carrier	21.5%	33.5%	1,622
Late-arriving aircraft	60.7%	39.3%	4,589
National Aviation System	17.4%	21.0%	1,316
Extreme weather	0.4%	5.9%	34
Security	0.0%	0.2%	0

7,561 delay minutes on 114 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 2026?

64.6% of 413 scheduled domestic departures left less than 15 minutes late, and 68.0% reached their destination on time. The national figures that month were 72.8% and 73.2%.

How does that compare with a year earlier?

In March 2025, 76.6% of 482 departures left on time and 1.9% were cancelled, against 64.6% and 3.9% in March 2026.

Provenance

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