Long Island MacArthur in April 2026

76.4%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 2026, reporting carriers scheduled 462 domestic departures from Long Island MacArthur (ISP). 76.4% left less than 15 minutes late and 76.8% reached their destination on time; 0.9% were cancelled.

Nationally that month, 79.1% of flights departed on time and 78.9% arrived on time, so ISP departures were 2.7 points below the national departure figure.

A year earlier, in April 2025, the airport had 536 departures with 82.6% leaving on time: a change of −6.2 points, with flights down 14%.

Flights arriving at ISP that month were on time 72.7% of the time (461 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 58%, air carrier 22% and national aviation system 20%.

On time 76.8%
Arrived 15+ minutes late 22.1%
Cancelled 0.9%
Diverted 0.2%

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

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

Measure	Apr 2026	Apr 2025	ISP, 12 months to Jul 2026	All reported flights, Apr 2026
Departed on time	76.4%	82.6%	73.7%	79.1%
Arrived on time	76.8%	82.6%	73.6%	78.9%
Cancelled	0.9%	0.2%	2.1%	0.9%
Average departure delay (late minutes only)	15.5 min	13.5 min	18.8 min	14.5 min
Scheduled departures a day	15	18	14	19,931
Scheduled departures	462	536	4,966	597,919

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	207	45%	84.5%	0.2 min	0.0%
B6 JetBlue Airways	162	35%	71.6%	10.0 min	0.6%
F9 Frontier Airlines	93	20%	68.8%	15.1 min	3.2%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–MCO	Islip to Orlando	127	72.4%	10.2 min	0.0%
ISP–BWI	Islip to Baltimore	106	89.6%	-5.6 min	0.0%
ISP–PBI	Islip to West Palm Beach/Palm Beach	106	69.8%	20.1 min	1.9%
ISP–TPA	Islip to Tampa	52	71.2%	6.0 min	1.9%
ISP–FLL	Islip to Fort Lauderdale	31	87.1%	-2.1 min	0.0%
ISP–RSW	Islip to Fort Myers	27	74.1%	1.7 min	0.0%
ISP–MYR	Islip to Myrtle Beach	13	76.9%	-3.4 min	7.7%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), April 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2026	Minutes
Air carrier	21.8%	33.5%	1,394
Late-arriving aircraft	57.8%	40.4%	3,704
National Aviation System	20.1%	21.0%	1,290
Extreme weather	0.3%	5.0%	18
Security	0.0%	0.1%	0

6,406 delay minutes on 102 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 2026?

76.4% of 462 scheduled domestic departures left less than 15 minutes late, and 76.8% reached their destination on time. The national figures that month were 79.1% and 78.9%.

How does that compare with a year earlier?

In April 2025, 82.6% of 536 departures left on time and 0.2% were cancelled, against 76.4% and 0.9% in April 2026.

Provenance

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