University of Illinois/Willard in December 2025

67.3%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 2025, reporting carriers scheduled 159 domestic departures from University of Illinois/Willard (CMI). 67.3% left less than 15 minutes late and 68.6% reached their destination on time; 5.7% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so CMI departures were 4.7 points below the national departure figure.

A year earlier, in December 2024, the airport had 89 departures with 80.9% leaving on time: a change of −13.6 points, with flights up 79%.

Flights arriving at CMI that month were on time 62.3% of the time (159 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 52%, national aviation system 25% and air carrier 23%.

On time 68.6%
Arrived 15+ minutes late 25.8%
Cancelled 5.7%
Diverted 0.0%

Every scheduled departure from CMI in December 2025, judged by arrival at the destination.

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

Measure	Dec 2025	Dec 2024	CMI, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	67.3%	80.9%	79.7%	72.0%
Arrived on time	68.6%	76.4%	77.6%	71.9%
Cancelled	5.7%	0.0%	3.0%	1.5%
Average departure delay (late minutes only)	27.3 min	16.7 min	18.0 min	21.2 min
Scheduled departures a day	5	3	5	19,410
Scheduled departures	159	89	1,785	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
MQ Envoy Air	159	100%	68.6%	18.7 min	5.7%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMI–ORD	Champaign/Urbana to Chicago	97	61.9%	33.0 min	6.2%
CMI–DFW	Champaign/Urbana to Dallas/Fort Worth	62	79.0%	-3.2 min	4.8%

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 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	23.4%	33.3%	975
Late-arriving aircraft	51.5%	41.1%	2,149
National Aviation System	24.6%	19.1%	1,026
Extreme weather	0.6%	6.4%	25
Security	0.0%	0.2%	0

4,175 delay minutes on 41 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 2025?

67.3% of 159 scheduled domestic departures left less than 15 minutes late, and 68.6% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 80.9% of 89 departures left on time and 0.0% were cancelled, against 67.3% and 5.7% in December 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 2025; 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.