Ellison Onizuka Kona International at Keahole in August 2025

90.5%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 2025, reporting carriers scheduled 1,343 domestic departures from Ellison Onizuka Kona International at Keahole (KOA). 90.5% left less than 15 minutes late and 90.2% reached their destination on time; 0.3% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so KOA departures were 13.7 points above the national departure figure.

A year earlier, in August 2024, the airport had 1,409 departures with 88.3% leaving on time: a change of +2.2 points, with flights down 5%.

Flights arriving at KOA that month were on time 87.1% of the time (1,343 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 60%, air carrier 33% and national aviation system 7%.

On time 90.2%
Arrived 15+ minutes late 9.2%
Cancelled 0.3%
Diverted 0.2%

Every scheduled departure from KOA in August 2025, judged by arrival at the destination.

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

Measure	Aug 2025	Aug 2024	KOA, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	90.5%	88.3%	85.7%	76.8%
Arrived on time	90.2%	90.1%	84.7%	76.3%
Cancelled	0.3%	0.7%	1.1%	1.1%
Average departure delay (late minutes only)	6.0 min	8.7 min	8.7 min	17.6 min
Scheduled departures a day	45	47	44	20,079
Scheduled departures	1,343	1,409	16,052	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
HA Hawaiian Airlines	612	46%	92.0%	-0.7 min	0.0%
WN Southwest Airlines	245	18%	95.9%	-9.2 min	0.0%
AS Alaska Airlines	214	16%	78.0%	9.8 min	1.4%
UA United Airlines	148	11%	86.5%	-8.0 min	0.7%
AA American Airlines	62	5%	95.2%	-11.5 min	0.0%
DL Delta Air Lines	62	5%	96.8%	-11.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
KOA–HNL	Kona to Honolulu	625	93.3%	-2.7 min	0.0%
KOA–LAX	Kona to Los Angeles	147	87.8%	-1.8 min	0.7%
KOA–OGG	Kona to Kahului	124	88.7%	0.5 min	0.0%
KOA–SEA	Kona to Seattle	121	89.3%	-3.8 min	2.5%
KOA–SFO	Kona to San Francisco	83	81.9%	-2.3 min	0.0%
KOA–SMF	Kona to Sacramento	44	97.7%	-10.9 min	0.0%
KOA–DEN	Kona to Denver	31	83.9%	-11.3 min	0.0%
KOA–LAS	Kona to Las Vegas	31	96.8%	-16.6 min	0.0%
KOA–LIH	Kona to Lihue	31	96.8%	-2.5 min	0.0%
KOA–PDX	Kona to Portland	31	61.3%	16.6 min	0.0%
KOA–PHX	Kona to Phoenix	31	100.0%	-12.4 min	0.0%
KOA–SAN	Kona to San Diego	31	77.4%	17.1 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 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	32.8%	33.1%	2,112
Late-arriving aircraft	60.3%	40.5%	3,881
National Aviation System	6.6%	19.2%	427
Extreme weather	0.0%	7.0%	1
Security	0.2%	0.1%	15

6,436 delay minutes on 124 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 KOA on time in August 2025?

90.5% of 1,343 scheduled domestic departures left less than 15 minutes late, and 90.2% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 88.3% of 1,409 departures left on time and 0.7% were cancelled, against 90.5% and 0.3% in August 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for August 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for KOA · methodology · corrections.