Ellison Onizuka Kona International at Keahole in September 2025

92.6%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 2025, reporting carriers scheduled 1,234 domestic departures from Ellison Onizuka Kona International at Keahole (KOA). 92.6% left less than 15 minutes late and 92.8% reached their destination on time; 0.5% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so KOA departures were 9.5 points above the national departure figure.

A year earlier, in September 2024, the airport had 1,332 departures with 92.2% leaving on time: a change of +0.4 points, with flights down 7%.

Flights arriving at KOA that month were on time 90.4% of the time (1,234 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 49%, late-arriving aircraft 41% and national aviation system 10%.

On time 92.8%
Arrived 15+ minutes late 6.6%
Cancelled 0.5%
Diverted 0.2%

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

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

Measure	Sep 2025	Sep 2024	KOA, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	92.6%	92.2%	85.7%	83.1%
Arrived on time	92.8%	92.0%	84.7%	82.8%
Cancelled	0.5%	0.5%	1.1%	0.5%
Average departure delay (late minutes only)	5.5 min	4.6 min	8.7 min	12.2 min
Scheduled departures a day	41	44	44	18,748
Scheduled departures	1,234	1,332	16,052	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
HA Hawaiian Airlines	557	45%	93.9%	-1.5 min	0.0%
WN Southwest Airlines	236	19%	95.8%	-13.5 min	1.7%
AS Alaska Airlines	201	16%	85.1%	-5.1 min	0.5%
UA United Airlines	120	10%	95.8%	-17.8 min	0.0%
AA American Airlines	60	5%	88.3%	8.5 min	1.7%
DL Delta Air Lines	60	5%	95.0%	-10.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
KOA–HNL	Kona to Honolulu	570	94.0%	-3.9 min	0.5%
KOA–LAX	Kona to Los Angeles	120	93.3%	-3.1 min	0.0%
KOA–OGG	Kona to Kahului	120	95.0%	-3.5 min	0.0%
KOA–SEA	Kona to Seattle	111	85.6%	-3.2 min	0.9%
KOA–SFO	Kona to San Francisco	77	93.5%	-13.1 min	0.0%
KOA–SMF	Kona to Sacramento	43	93.0%	-10.5 min	0.0%
KOA–DEN	Kona to Denver	30	93.3%	-19.5 min	0.0%
KOA–LAS	Kona to Las Vegas	30	96.7%	-25.5 min	3.3%
KOA–LIH	Kona to Lihue	30	100.0%	-4.5 min	0.0%
KOA–PDX	Kona to Portland	30	76.7%	2.9 min	0.0%
KOA–PHX	Kona to Phoenix	30	93.3%	-16.8 min	3.3%
KOA–SAN	Kona to San Diego	30	90.0%	-14.2 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 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	49.4%	34.3%	2,749
Late-arriving aircraft	40.9%	37.4%	2,279
National Aviation System	9.7%	22.6%	541
Extreme weather	0.0%	5.6%	0
Security	0.0%	0.1%	0

5,569 delay minutes on 81 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 September 2025?

92.6% of 1,234 scheduled domestic departures left less than 15 minutes late, and 92.8% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 92.2% of 1,332 departures left on time and 0.5% were cancelled, against 92.6% and 0.5% in September 2025.

Provenance

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