University of Illinois/Willard in May 2025

84.7%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 May 2025, reporting carriers scheduled 150 domestic departures from University of Illinois/Willard (CMI). 84.7% left less than 15 minutes late and 81.3% reached their destination on time; 0.0% were cancelled.

Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so CMI departures were 8.0 points above the national departure figure.

A year earlier, in May 2024, the airport had 124 departures with 65.3% leaving on time: a change of +19.4 points, with flights up 21%.

Flights arriving at CMI that month were on time 82.0% of the time (150 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 37%, air carrier 27% and national aviation system 21%.

On time 81.3%
Arrived 15+ minutes late 18.0%
Cancelled 0.0%
Diverted 0.7%

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

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

Measure	May 2025	May 2024	CMI, 12 months to Jul 2026	All reported flights, May 2025
Departed on time	84.7%	65.3%	79.7%	76.7%
Arrived on time	81.3%	63.7%	77.6%	75.4%
Cancelled	0.0%	2.4%	3.0%	1.0%
Average departure delay (late minutes only)	14.3 min	35.4 min	18.0 min	17.5 min
Scheduled departures a day	5	4	5	20,188
Scheduled departures	150	124	1,785	605,648

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
MQ Envoy Air	150	100%	81.3%	6.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMI–ORD	Champaign/Urbana to Chicago	89	84.3%	-0.5 min	0.0%
CMI–DFW	Champaign/Urbana to Dallas/Fort Worth	61	77.0%	15.7 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), May 2025.

Delay causes

BTS cause category	Share of delay minutes	National, May 2025	Minutes
Air carrier	26.9%	29.3%	641
Late-arriving aircraft	37.2%	37.8%	887
National Aviation System	21.2%	25.9%	506
Extreme weather	14.7%	6.9%	351
Security	0.0%	0.1%	0

2,385 delay minutes on 27 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 May 2025?

84.7% of 150 scheduled domestic departures left less than 15 minutes late, and 81.3% reached their destination on time. The national figures that month were 76.7% and 75.4%.

How does that compare with a year earlier?

In May 2024, 65.3% of 124 departures left on time and 2.4% were cancelled, against 84.7% and 0.0% in May 2025.

Provenance

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