Long Island MacArthur in January 2025

79.8%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 2025, reporting carriers scheduled 411 domestic departures from Long Island MacArthur (ISP). 79.8% left less than 15 minutes late and 78.6% reached their destination on time; 0.7% were cancelled.

Nationally that month, 79.3% of flights departed on time and 78.6% arrived on time, so ISP departures were 0.5 points above the national departure figure.

A year earlier, in January 2024, the airport had 479 departures with 76.4% leaving on time: a change of +3.4 points, with flights down 14%.

Flights arriving at ISP that month were on time 78.6% of the time (411 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 42%, air carrier 34% and national aviation system 24%.

On time 78.6%
Arrived 15+ minutes late 20.7%
Cancelled 0.7%
Diverted 0.0%

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

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

Measure	Jan 2025	Jan 2024	ISP, 12 months to Jul 2026	All reported flights, Jan 2025
Departed on time	79.8%	76.4%	73.7%	79.3%
Arrived on time	78.6%	73.3%	73.6%	78.6%
Cancelled	0.7%	1.9%	2.1%	3.0%
Average departure delay (late minutes only)	13.8 min	17.6 min	18.8 min	14.0 min
Scheduled departures a day	14	16	14	17,992
Scheduled departures	411	479	4,966	539,747

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	233	57%	81.1%	1.9 min	0.9%
F9 Frontier Airlines	111	27%	78.4%	7.1 min	0.9%
B6 JetBlue Airways	67	16%	70.1%	11.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–MCO	Islip to Orlando	119	79.0%	4.7 min	1.7%
ISP–PBI	Islip to West Palm Beach/Palm Beach	109	67.9%	18.2 min	0.0%
ISP–BWI	Islip to Baltimore	89	88.8%	-11.5 min	1.1%
ISP–TPA	Islip to Tampa	35	74.3%	3.7 min	0.0%
ISP–MIA	Islip to Miami	29	82.8%	8.5 min	0.0%
ISP–FLL	Islip to Fort Lauderdale	24	83.3%	5.0 min	0.0%
ISP–RSW	Islip to Fort Myers	6	100.0%	-8.3 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), January 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jan 2025	Minutes
Air carrier	33.6%	36.2%	1,907
Late-arriving aircraft	41.9%	34.7%	2,379
National Aviation System	23.8%	19.9%	1,349
Extreme weather	0.8%	9.1%	44
Security	0.0%	0.2%	0

5,679 delay minutes on 85 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 2025?

79.8% of 411 scheduled domestic departures left less than 15 minutes late, and 78.6% reached their destination on time. The national figures that month were 79.3% and 78.6%.

How does that compare with a year earlier?

In January 2024, 76.4% of 479 departures left on time and 1.9% were cancelled, against 79.8% and 0.7% in January 2025.

Provenance

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