University of Illinois/Willard in April 2025

81.7%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 April 2025, reporting carriers scheduled 142 domestic departures from University of Illinois/Willard (CMI). 81.7% left less than 15 minutes late and 73.2% reached their destination on time; 2.1% were cancelled.

Nationally that month, 80.6% of flights departed on time and 79.5% arrived on time, so CMI departures were 1.1 points above the national departure figure.

A year earlier, in April 2024, the airport had 120 departures with 82.5% leaving on time: a change of −0.8 points, with flights up 18%.

Flights arriving at CMI that month were on time 83.1% of the time (142 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 55%, late-arriving aircraft 17% and national aviation system 17%.

On time 73.2%
Arrived 15+ minutes late 23.9%
Cancelled 2.1%
Diverted 0.7%

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

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

Measure	Apr 2025	Apr 2024	CMI, 12 months to Jul 2026	All reported flights, Apr 2025
Departed on time	81.7%	82.5%	79.7%	80.6%
Arrived on time	73.2%	83.3%	77.6%	79.5%
Cancelled	2.1%	0.8%	3.0%	0.8%
Average departure delay (late minutes only)	28.7 min	25.3 min	18.0 min	14.1 min
Scheduled departures a day	5	4	5	19,465
Scheduled departures	142	120	1,785	583,950

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
MQ Envoy Air	142	100%	73.2%	22.5 min	2.1%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMI–ORD	Champaign/Urbana to Chicago	82	76.8%	4.5 min	1.2%
CMI–DFW	Champaign/Urbana to Dallas/Fort Worth	60	68.3%	47.9 min	3.3%

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), April 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Apr 2025	Minutes
Air carrier	55.2%	32.7%	2,331
Late-arriving aircraft	17.2%	39.4%	727
National Aviation System	17.1%	22.2%	723
Extreme weather	10.5%	5.5%	442
Security	0.0%	0.2%	0

4,223 delay minutes on 34 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 April 2025?

81.7% of 142 scheduled domestic departures left less than 15 minutes late, and 73.2% reached their destination on time. The national figures that month were 80.6% and 79.5%.

How does that compare with a year earlier?

In April 2024, 82.5% of 120 departures left on time and 0.8% were cancelled, against 81.7% and 2.1% in April 2025.

Provenance

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