Long Island MacArthur in August 2023

70.1%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 August 2023, reporting carriers scheduled 381 domestic departures from Long Island MacArthur (ISP). 70.1% left less than 15 minutes late and 74.3% reached their destination on time; 4.2% were cancelled.

Nationally that month, 76.7% of flights departed on time and 76.9% arrived on time, so ISP departures were 6.6 points below the national departure figure.

Flights arriving at ISP that month were on time 66.2% of the time (379 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 53%, air carrier 27% and national aviation system 20%.

On time 74.3%
Arrived 15+ minutes late 20.7%
Cancelled 4.2%
Diverted 0.8%

Every scheduled departure from ISP in August 2023, judged by arrival at the destination.

August 2023 against a year earlier, the airport's year and the nation

Measure	Aug 2023	Year earlier	ISP, 12 months to Jul 2026	All reported flights, Aug 2023
Departed on time	70.1%	—	73.7%	76.7%
Arrived on time	74.3%	—	73.6%	76.9%
Cancelled	4.2%	—	2.1%	1.5%
Average departure delay (late minutes only)	19.9 min	—	18.8 min	17.3 min
Scheduled departures a day	13	—	14	20,100
Scheduled departures	381	—	4,966	602,987

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	208	55%	82.2%	1.5 min	1.0%
F9 Frontier Airlines	173	45%	64.7%	20.0 min	8.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ISP–BWI	Islip to Baltimore	128	85.2%	0.6 min	0.8%
ISP–MCO	Islip to Orlando	110	67.3%	21.3 min	5.5%
ISP–TPA	Islip to Tampa	44	50.0%	22.8 min	11.4%
ISP–PBI	Islip to West Palm Beach/Palm Beach	42	73.8%	10.0 min	2.4%
ISP–FLL	Islip to Fort Lauderdale	31	83.9%	0.5 min	3.2%
ISP–MYR	Islip to Myrtle Beach	16	75.0%	-3.4 min	12.5%
ISP–RDU	Islip to Raleigh/Durham	8	87.5%	0.8 min	0.0%
ISP–BNA	Islip to Nashville	2	100.0%	-13.0 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), August 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2023	Minutes
Air carrier	27.2%	36.7%	1,601
Late-arriving aircraft	52.6%	42.2%	3,102
National Aviation System	19.5%	15.7%	1,150
Extreme weather	0.7%	5.1%	39
Security	0.0%	0.2%	0

5,892 delay minutes on 79 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 August 2023?

70.1% of 381 scheduled domestic departures left less than 15 minutes late, and 74.3% reached their destination on time. The national figures that month were 76.7% and 76.9%.

How does that compare with a year earlier?

August 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2023; 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.