University of Illinois/Willard in August 2025

80.1%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 2025, reporting carriers scheduled 146 domestic departures from University of Illinois/Willard (CMI). 80.1% left less than 15 minutes late and 76.7% reached their destination on time; 2.1% were cancelled.

Nationally that month, 76.8% of flights departed on time and 76.3% arrived on time, so CMI departures were 3.3 points above the national departure figure.

A year earlier, in August 2024, the airport had 126 departures with 82.5% leaving on time: a change of −2.4 points, with flights up 16%.

Flights arriving at CMI that month were on time 74.7% of the time (146 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 61%, national aviation system 24% and air carrier 15%.

On time 76.7%
Arrived 15+ minutes late 20.5%
Cancelled 2.1%
Diverted 0.7%

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

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

Measure	Aug 2025	Aug 2024	CMI, 12 months to Jul 2026	All reported flights, Aug 2025
Departed on time	80.1%	82.5%	79.7%	76.8%
Arrived on time	76.7%	85.7%	77.6%	76.3%
Cancelled	2.1%	0.0%	3.0%	1.1%
Average departure delay (late minutes only)	14.3 min	12.8 min	18.0 min	17.6 min
Scheduled departures a day	5	4	5	20,079
Scheduled departures	146	126	1,785	602,378

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
MQ Envoy Air	146	100%	76.7%	2.8 min	2.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMI–ORD	Champaign/Urbana to Chicago	84	72.6%	5.1 min	3.6%
CMI–DFW	Champaign/Urbana to Dallas/Fort Worth	62	82.3%	-0.3 min	0.0%

By scheduled departure hour

100

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

Share of departures that left less than 15 minutes late, by scheduled hour (local time), August 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Aug 2025	Minutes
Air carrier	14.9%	33.1%	299
Late-arriving aircraft	60.7%	40.5%	1,220
National Aviation System	23.7%	19.2%	477
Extreme weather	0.7%	7.0%	15
Security	0.0%	0.1%	0

2,011 delay minutes on 30 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 August 2025?

80.1% of 146 scheduled domestic departures left less than 15 minutes late, and 76.7% reached their destination on time. The national figures that month were 76.8% and 76.3%.

How does that compare with a year earlier?

In August 2024, 82.5% of 126 departures left on time and 0.0% were cancelled, against 80.1% and 2.1% in August 2025.

Provenance

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