Chicago O'Hare International in October 2023

85.4%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 October 2023, reporting carriers scheduled 22,812 domestic departures from Chicago O'Hare International (ORD). 85.4% left less than 15 minutes late and 83.0% reached their destination on time; 0.2% were cancelled.

Nationally that month, 83.8% of flights departed on time and 84.0% arrived on time, so ORD departures were 1.6 points above the national departure figure.

Flights arriving at ORD that month were on time 85.9% of the time (22,798 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 43%, late-arriving aircraft 38% and national aviation system 17%.

On time 83.0%
Arrived 15+ minutes late 16.7%
Cancelled 0.2%
Diverted 0.1%

Every scheduled departure from ORD in October 2023, judged by arrival at the destination.

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

Measure	Oct 2023	Year earlier	ORD, 12 months to Jul 2026	All reported flights, Oct 2023
Departed on time	85.4%	—	71.4%	83.8%
Arrived on time	83.0%	—	69.4%	84.0%
Cancelled	0.2%	—	2.8%	0.4%
Average departure delay (late minutes only)	10.1 min	—	22.3 min	11.0 min
Scheduled departures a day	760	—	986	19,966
Scheduled departures	22,812	—	359,911	598,968

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
UA United Airlines	7,942	35%	85.6%	-1.3 min	0.1%
OO SkyWest Airlines	4,942	22%	79.9%	5.9 min	0.2%
AA American Airlines	3,960	17%	83.4%	2.1 min	0.2%
MQ Envoy Air	2,069	9%	80.2%	3.0 min	0.3%
DL Delta Air Lines	999	4%	88.9%	-2.6 min	0.2%
WN Southwest Airlines	880	4%	77.3%	6.2 min	0.2%
YX Republic Airline	849	4%	89.2%	-4.7 min	0.0%
NK Spirit Airlines	729	3%	74.5%	10.9 min	2.2%
AS Alaska Airlines	257	1%	82.9%	-3.0 min	0.4%
B6 JetBlue Airways	96	0%	65.6%	15.9 min	0.0%
F9 Frontier Airlines	89	0%	74.2%	6.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
ORD–LGA	Chicago to New York	785	89.0%	-3.3 min	0.3%
ORD–DFW	Chicago to Dallas/Fort Worth	594	82.2%	2.1 min	0.8%
ORD–LAX	Chicago to Los Angeles	584	83.4%	0.0 min	0.2%
ORD–DEN	Chicago to Denver	562	80.6%	2.1 min	0.4%
ORD–PHX	Chicago to Phoenix	552	81.3%	0.7 min	0.0%
ORD–BOS	Chicago to Boston	526	80.8%	2.7 min	0.2%
ORD–LAS	Chicago to Las Vegas	526	82.3%	-2.4 min	0.2%
ORD–DCA	Chicago to Washington	515	85.6%	0.4 min	0.0%
ORD–ATL	Chicago to Atlanta	513	83.0%	4.7 min	1.2%
ORD–EWR	Chicago to Newark	498	88.0%	-2.6 min	0.0%
ORD–MCO	Chicago to Orlando	448	79.9%	0.6 min	1.3%
ORD–DTW	Chicago to Detroit	446	85.9%	3.7 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), October 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Oct 2023	Minutes
Air carrier	43.0%	41.3%	91,883
Late-arriving aircraft	38.1%	40.5%	81,354
National Aviation System	17.2%	14.4%	36,744
Extreme weather	1.5%	3.7%	3,158
Security	0.2%	0.2%	446

213,585 delay minutes on 3,810 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 October 2023?

85.4% of 22,812 scheduled domestic departures left less than 15 minutes late, and 83.0% reached their destination on time. The national figures that month were 83.8% and 84.0%.

How does that compare with a year earlier?

October 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 October 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.