Long Island MacArthur in December 2024

68.1%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 December 2024, reporting carriers scheduled 432 domestic departures from Long Island MacArthur (ISP). 68.1% left less than 15 minutes late and 71.1% reached their destination on time; 0.7% were cancelled.

Nationally that month, 77.8% of flights departed on time and 78.1% arrived on time, so ISP departures were 9.7 points below the national departure figure.

A year earlier, in December 2023, the airport had 530 departures with 73.0% leaving on time: a change of −4.9 points, with flights down 18%.

Flights arriving at ISP that month were on time 73.4% of the time (433 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 43%, air carrier 36% and national aviation system 21%.

On time 71.1%
Arrived 15+ minutes late 28.0%
Cancelled 0.7%
Diverted 0.2%

Every scheduled departure from ISP in December 2024, judged by arrival at the destination.

December 2024 against a year earlier, the airport's year and the nation

Measure	Dec 2024	Dec 2023	ISP, 12 months to Jul 2026	All reported flights, Dec 2024
Departed on time	68.1%	73.0%	73.7%	77.8%
Arrived on time	71.1%	74.3%	73.6%	78.1%
Cancelled	0.7%	1.5%	2.1%	0.7%
Average departure delay (late minutes only)	26.3 min	19.3 min	18.8 min	16.6 min
Scheduled departures a day	14	18	14	19,686
Scheduled departures	432	530	4,966	590,581

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	232	54%	78.0%	8.5 min	1.3%
F9 Frontier Airlines	134	31%	62.7%	25.8 min	0.0%
B6 JetBlue Airways	66	15%	63.6%	27.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–MCO	Islip to Orlando	131	74.0%	13.6 min	0.0%
ISP–PBI	Islip to West Palm Beach/Palm Beach	109	57.8%	36.4 min	0.9%
ISP–BWI	Islip to Baltimore	94	90.4%	-4.1 min	1.1%
ISP–TPA	Islip to Tampa	36	50.0%	29.4 min	0.0%
ISP–FLL	Islip to Fort Lauderdale	32	71.9%	1.7 min	0.0%
ISP–MIA	Islip to Miami	15	80.0%	-2.5 min	6.7%
ISP–RSW	Islip to Fort Myers	14	57.1%	58.5 min	0.0%
ISP–MYR	Islip to Myrtle Beach	1	100.0%	-8.0 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), December 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2024	Minutes
Air carrier	35.5%	34.3%	3,561
Late-arriving aircraft	42.5%	40.2%	4,269
National Aviation System	21.3%	17.8%	2,138
Extreme weather	0.7%	7.5%	67
Security	0.0%	0.2%	0

10,035 delay minutes on 121 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 December 2024?

68.1% of 432 scheduled domestic departures left less than 15 minutes late, and 71.1% reached their destination on time. The national figures that month were 77.8% and 78.1%.

How does that compare with a year earlier?

In December 2023, 73.0% of 530 departures left on time and 1.5% were cancelled, against 68.1% and 0.7% in December 2024.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 2024; 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.