Long Island MacArthur in May 2026

83.7%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 May 2026, reporting carriers scheduled 393 domestic departures from Long Island MacArthur (ISP). 83.7% left less than 15 minutes late and 82.2% reached their destination on time; 0.0% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so ISP departures were 6.6 points above the national departure figure.

A year earlier, in May 2025, the airport had 536 departures with 74.4% leaving on time: a change of +9.3 points, with flights down 27%.

Flights arriving at ISP that month were on time 79.3% of the time (392 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 44%, air carrier 38% and national aviation system 15%.

On time 82.2%
Arrived 15+ minutes late 17.3%
Cancelled 0.0%
Diverted 0.5%

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

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

Measure	May 2026	May 2025	ISP, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	83.7%	74.4%	73.7%	77.1%
Arrived on time	82.2%	71.6%	73.6%	77.6%
Cancelled	0.0%	1.7%	2.1%	0.9%
Average departure delay (late minutes only)	12.1 min	20.2 min	18.8 min	16.0 min
Scheduled departures a day	13	18	14	20,391
Scheduled departures	393	536	4,966	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	220	56%	82.3%	4.4 min	0.0%
B6 JetBlue Airways	110	28%	80.9%	2.3 min	0.0%
F9 Frontier Airlines	63	16%	84.1%	-1.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–MCO	Islip to Orlando	126	73.0%	11.5 min	0.0%
ISP–BWI	Islip to Baltimore	114	93.9%	-4.1 min	0.0%
ISP–PBI	Islip to West Palm Beach/Palm Beach	83	79.5%	2.9 min	0.0%
ISP–FLL	Islip to Fort Lauderdale	31	80.6%	0.6 min	0.0%
ISP–TPA	Islip to Tampa	20	70.0%	7.0 min	0.0%
ISP–MYR	Islip to Myrtle Beach	19	100.0%	-12.6 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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	38.2%	33.0%	1,694
Late-arriving aircraft	44.4%	40.4%	1,972
National Aviation System	14.9%	20.5%	662
Extreme weather	2.5%	6.0%	109
Security	0.0%	0.1%	0

4,437 delay minutes on 68 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 May 2026?

83.7% of 393 scheduled domestic departures left less than 15 minutes late, and 82.2% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 74.4% of 536 departures left on time and 1.7% were cancelled, against 83.7% and 0.0% in May 2026.

Provenance

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