Chicago O'Hare International in August 2023

77.1%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 23,347 domestic departures from Chicago O'Hare International (ORD). 77.1% left less than 15 minutes late and 75.3% reached their destination on time; 1.3% were cancelled.

Nationally that month, 76.7% of flights departed on time and 76.9% arrived on time, so ORD departures were level with the national departure figure.

Flights arriving at ORD that month were on time 77.7% of the time (23,346 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 43%, air carrier 38% and national aviation system 15%.

On time 75.3%
Arrived 15+ minutes late 23.2%
Cancelled 1.3%
Diverted 0.2%

Every scheduled departure from ORD 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	ORD, 12 months to Jul 2026	All reported flights, Aug 2023
Departed on time	77.1%	—	71.4%	76.7%
Arrived on time	75.3%	—	69.4%	76.9%
Cancelled	1.3%	—	2.8%	1.5%
Average departure delay (late minutes only)	17.3 min	—	22.3 min	17.3 min
Scheduled departures a day	778	—	986	20,100
Scheduled departures	23,347	—	359,911	602,987

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	8,289	36%	76.4%	7.0 min	1.4%
OO SkyWest Airlines	4,769	20%	76.4%	9.3 min	1.3%
AA American Airlines	4,397	19%	72.5%	18.2 min	1.3%
MQ Envoy Air	2,099	9%	77.0%	7.1 min	0.8%
DL Delta Air Lines	1,040	4%	76.9%	9.3 min	1.4%
WN Southwest Airlines	851	4%	70.6%	11.2 min	1.9%
YX Republic Airline	807	3%	84.8%	-0.8 min	1.1%
NK Spirit Airlines	625	3%	65.0%	18.1 min	1.8%
AS Alaska Airlines	351	2%	68.1%	11.3 min	0.3%
B6 JetBlue Airways	62	0%	62.9%	18.9 min	0.0%
F9 Frontier Airlines	57	0%	54.4%	55.9 min	3.5%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ORD–LGA	Chicago to New York	809	75.8%	8.6 min	2.5%
ORD–LAX	Chicago to Los Angeles	606	73.4%	12.6 min	0.8%
ORD–BOS	Chicago to Boston	585	70.4%	15.5 min	1.0%
ORD–DEN	Chicago to Denver	577	76.6%	7.9 min	1.0%
ORD–SEA	Chicago to Seattle	563	77.1%	4.0 min	0.4%
ORD–DCA	Chicago to Washington	538	72.9%	14.8 min	2.8%
ORD–ATL	Chicago to Atlanta	534	68.2%	17.5 min	1.5%
ORD–DFW	Chicago to Dallas/Fort Worth	505	77.2%	10.6 min	1.0%
ORD–SFO	Chicago to San Francisco	491	77.2%	8.4 min	0.0%
ORD–PHX	Chicago to Phoenix	463	77.8%	10.0 min	0.9%
ORD–EWR	Chicago to Newark	459	71.5%	11.5 min	1.3%
ORD–LAS	Chicago to Las Vegas	448	70.5%	13.0 min	1.3%

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), August 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2023	Minutes
Air carrier	38.4%	36.7%	144,702
Late-arriving aircraft	43.1%	42.2%	162,559
National Aviation System	15.4%	15.7%	58,133
Extreme weather	3.1%	5.1%	11,613
Security	0.1%	0.2%	225

377,232 delay minutes on 5,406 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 ORD on time in August 2023?

77.1% of 23,347 scheduled domestic departures left less than 15 minutes late, and 75.3% 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 ORD · methodology · corrections.