University of Illinois/Willard in December 2023

88.6%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 December 2023, reporting carriers scheduled 123 domestic departures from University of Illinois/Willard (CMI). 88.6% left less than 15 minutes late and 91.1% reached their destination on time; 0.0% were cancelled.

Nationally that month, 83.1% of flights departed on time and 83.8% arrived on time, so CMI departures were 5.5 points above the national departure figure.

Flights arriving at CMI that month were on time 81.3% of the time (123 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 63%, air carrier 33% and national aviation system 4%.

On time 91.1%
Arrived 15+ minutes late 8.9%
Cancelled 0.0%
Diverted 0.0%

Every scheduled departure from CMI in December 2023, judged by arrival at the destination.

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

Measure	Dec 2023	Year earlier	CMI, 12 months to Jul 2026	All reported flights, Dec 2023
Departed on time	88.6%	—	79.7%	83.1%
Arrived on time	91.1%	—	77.6%	83.8%
Cancelled	0.0%	—	3.0%	0.4%
Average departure delay (late minutes only)	7.0 min	—	18.0 min	11.6 min
Scheduled departures a day	4	—	5	19,013
Scheduled departures	123	—	1,785	570,394

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
MQ Envoy Air	123	100%	91.1%	-9.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMI–ORD	Champaign/Urbana to Chicago	62	88.7%	-5.5 min	0.0%
CMI–DFW	Champaign/Urbana to Dallas/Fort Worth	61	93.4%	-14.5 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), December 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2023	Minutes
Air carrier	33.0%	37.1%	212
Late-arriving aircraft	62.6%	38.8%	402
National Aviation System	4.4%	17.6%	28
Extreme weather	0.0%	6.2%	0
Security	0.0%	0.3%	0

642 delay minutes on 11 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 CMI on time in December 2023?

88.6% of 123 scheduled domestic departures left less than 15 minutes late, and 91.1% reached their destination on time. The national figures that month were 83.1% and 83.8%.

How does that compare with a year earlier?

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