Long Island MacArthur in January 2026

73.1%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 January 2026, reporting carriers scheduled 435 domestic departures from Long Island MacArthur (ISP). 73.1% left less than 15 minutes late and 66.9% reached their destination on time; 4.6% were cancelled.

Nationally that month, 75.6% of flights departed on time and 75.3% arrived on time, so ISP departures were 2.5 points below the national departure figure.

A year earlier, in January 2025, the airport had 411 departures with 79.8% leaving on time: a change of −6.7 points, with flights up 6%.

Flights arriving at ISP that month were on time 75.0% of the time (432 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 39%, national aviation system 33% and air carrier 28%.

On time 66.9%
Arrived 15+ minutes late 28.3%
Cancelled 4.6%
Diverted 0.2%

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

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

Measure	Jan 2026	Jan 2025	ISP, 12 months to Jul 2026	All reported flights, Jan 2026
Departed on time	73.1%	79.8%	73.7%	75.6%
Arrived on time	66.9%	78.6%	73.6%	75.3%
Cancelled	4.6%	0.7%	2.1%	4.7%
Average departure delay (late minutes only)	13.3 min	13.8 min	18.8 min	16.7 min
Scheduled departures a day	15	14	14	18,133
Scheduled departures	435	411	4,966	544,003

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	206	47%	72.8%	3.8 min	4.4%
B6 JetBlue Airways	171	39%	62.0%	13.0 min	5.3%
F9 Frontier Airlines	58	13%	60.3%	7.8 min	3.4%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–PBI	Islip to West Palm Beach/Palm Beach	130	60.8%	12.5 min	3.1%
ISP–MCO	Islip to Orlando	105	74.3%	4.9 min	4.8%
ISP–BWI	Islip to Baltimore	93	83.9%	-5.2 min	4.3%
ISP–TPA	Islip to Tampa	43	65.1%	6.6 min	7.0%
ISP–FLL	Islip to Fort Lauderdale	36	47.2%	23.8 min	8.3%
ISP–RSW	Islip to Fort Myers	28	39.3%	22.7 min	3.6%

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), January 2026.

Delay causes

BTS cause category	Share of delay minutes	National, Jan 2026	Minutes
Air carrier	28.1%	37.3%	1,673
Late-arriving aircraft	39.3%	35.0%	2,339
National Aviation System	32.5%	18.0%	1,934
Extreme weather	0.0%	9.6%	0
Security	0.0%	0.1%	0

5,946 delay minutes on 123 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 January 2026?

73.1% of 435 scheduled domestic departures left less than 15 minutes late, and 66.9% reached their destination on time. The national figures that month were 75.6% and 75.3%.

How does that compare with a year earlier?

In January 2025, 79.8% of 411 departures left on time and 0.7% were cancelled, against 73.1% and 4.6% in January 2026.

Provenance

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