Long Island MacArthur in September 2024

84.9%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 September 2024, reporting carriers scheduled 292 domestic departures from Long Island MacArthur (ISP). 84.9% left less than 15 minutes late and 88.0% reached their destination on time; 1.0% were cancelled.

Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so ISP departures were 0.5 points above the national departure figure.

A year earlier, in September 2023, the airport had 333 departures with 76.0% leaving on time: a change of +8.9 points, with flights down 12%.

Flights arriving at ISP that month were on time 84.2% of the time (291 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 63%, extreme weather 13% and air carrier 12%.

On time 88.0%
Arrived 15+ minutes late 11.0%
Cancelled 1.0%
Diverted 0.0%

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

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

Measure	Sep 2024	Sep 2023	ISP, 12 months to Jul 2026	All reported flights, Sep 2024
Departed on time	84.9%	76.0%	73.7%	84.4%
Arrived on time	88.0%	73.6%	73.6%	83.9%
Cancelled	1.0%	0.9%	2.1%	0.6%
Average departure delay (late minutes only)	10.1 min	20.6 min	18.8 min	10.6 min
Scheduled departures a day	10	11	14	19,421
Scheduled departures	292	333	4,966	582,622

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	216	74%	89.8%	-2.5 min	0.0%
F9 Frontier Airlines	76	26%	82.9%	4.2 min	3.9%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–MCO	Islip to Orlando	97	88.7%	-0.8 min	0.0%
ISP–BWI	Islip to Baltimore	94	93.6%	-4.1 min	0.0%
ISP–PBI	Islip to West Palm Beach/Palm Beach	47	85.1%	-0.2 min	0.0%
ISP–TPA	Islip to Tampa	30	83.3%	2.8 min	6.7%
ISP–MYR	Islip to Myrtle Beach	18	77.8%	9.4 min	5.6%
ISP–FLL	Islip to Fort Lauderdale	5	80.0%	-12.4 min	0.0%
ISP–ATL	Islip to Atlanta	1	0.0%	57.0 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), September 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2024	Minutes
Air carrier	12.3%	38.6%	265
Late-arriving aircraft	63.3%	38.4%	1,362
National Aviation System	9.4%	18.2%	203
Extreme weather	13.3%	4.8%	286
Security	1.7%	0.1%	36

2,152 delay minutes on 32 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 September 2024?

84.9% of 292 scheduled domestic departures left less than 15 minutes late, and 88.0% reached their destination on time. The national figures that month were 84.4% and 83.9%.

How does that compare with a year earlier?

In September 2023, 76.0% of 333 departures left on time and 0.9% were cancelled, against 84.9% and 1.0% in September 2024.

Provenance

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