Ontario International in November 2023

85.6%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 November 2023, reporting carriers scheduled 2,091 domestic departures from Ontario International (ONT). 85.6% left less than 15 minutes late and 88.0% reached their destination on time; 0.0% were cancelled.

Nationally that month, 86.0% of flights departed on time and 86.2% arrived on time, so ONT departures were level with the national departure figure.

Flights arriving at ONT that month were on time 84.1% of the time (2,087 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 48%, late-arriving aircraft 35% and national aviation system 10%.

On time 88.0%
Arrived 15+ minutes late 11.8%
Cancelled 0.0%
Diverted 0.1%

Every scheduled departure from ONT in November 2023, judged by arrival at the destination.

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

Measure	Nov 2023	Year earlier	ONT, 12 months to Jul 2026	All reported flights, Nov 2023
Departed on time	85.6%	—	80.3%	86.0%
Arrived on time	88.0%	—	81.2%	86.2%
Cancelled	0.0%	—	0.9%	0.1%
Average departure delay (late minutes only)	10.9 min	—	13.7 min	9.4 min
Scheduled departures a day	70	—	71	18,793
Scheduled departures	2,091	—	25,854	563,777

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
WN Southwest Airlines	951	45%	90.0%	-4.1 min	0.0%
OO SkyWest Airlines	253	12%	86.6%	1.8 min	0.0%
AA American Airlines	251	12%	90.4%	-2.7 min	0.0%
F9 Frontier Airlines	236	11%	80.5%	6.9 min	0.0%
DL Delta Air Lines	134	6%	94.8%	-11.1 min	0.0%
AS Alaska Airlines	118	6%	82.2%	0.5 min	0.8%
UA United Airlines	88	4%	88.6%	-5.7 min	0.0%
B6 JetBlue Airways	30	1%	80.0%	22.9 min	0.0%
HA Hawaiian Airlines	30	1%	73.3%	5.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ONT–PHX	Ontario to Phoenix	263	92.4%	-3.5 min	0.0%
ONT–DEN	Ontario to Denver	235	89.8%	-4.7 min	0.0%
ONT–LAS	Ontario to Las Vegas	231	87.9%	-2.1 min	0.0%
ONT–SEA	Ontario to Seattle	194	83.0%	2.1 min	0.5%
ONT–DFW	Ontario to Dallas/Fort Worth	182	86.3%	2.0 min	0.0%
ONT–SFO	Ontario to San Francisco	147	79.6%	7.4 min	0.0%
ONT–SMF	Ontario to Sacramento	145	91.0%	-8.0 min	0.0%
ONT–OAK	Ontario to Oakland	144	91.7%	-6.6 min	0.0%
ONT–SJC	Ontario to San Jose	120	89.2%	-3.5 min	0.0%
ONT–SLC	Ontario to Salt Lake City	89	95.5%	-10.7 min	0.0%
ONT–ATL	Ontario to Atlanta	72	95.8%	-11.6 min	0.0%
ONT–PDX	Ontario to Portland	34	91.2%	-6.1 min	0.0%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), November 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Nov 2023	Minutes
Air carrier	48.3%	42.5%	8,592
Late-arriving aircraft	35.0%	37.3%	6,223
National Aviation System	9.9%	16.2%	1,755
Extreme weather	6.9%	3.7%	1,232
Security	0.0%	0.3%	0

17,802 delay minutes on 247 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 ONT on time in November 2023?

85.6% of 2,091 scheduled domestic departures left less than 15 minutes late, and 88.0% reached their destination on time. The national figures that month were 86.0% and 86.2%.

How does that compare with a year earlier?

November 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 November 2023; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for ONT · methodology · corrections.