University of Illinois/Willard in May 2026

86.1%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 May 2026, reporting carriers scheduled 151 domestic departures from University of Illinois/Willard (CMI). 86.1% left less than 15 minutes late and 79.5% reached their destination on time; 2.0% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so CMI departures were 9.0 points above the national departure figure.

A year earlier, in May 2025, the airport had 150 departures with 84.7% leaving on time: a change of +1.4 points, with flights up 1%.

Flights arriving at CMI that month were on time 80.8% of the time (151 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 32%, national aviation system 28% and air carrier 26%.

On time 79.5%
Arrived 15+ minutes late 17.9%
Cancelled 2.0%
Diverted 0.7%

Every scheduled departure from CMI in May 2026, judged by arrival at the destination.

May 2026 against a year earlier, the airport's year and the nation

Measure	May 2026	May 2025	CMI, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	86.1%	84.7%	79.7%	77.1%
Arrived on time	79.5%	81.3%	77.6%	77.6%
Cancelled	2.0%	0.0%	3.0%	0.9%
Average departure delay (late minutes only)	12.2 min	14.3 min	18.0 min	16.0 min
Scheduled departures a day	5	5	5	20,391
Scheduled departures	151	150	1,785	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
MQ Envoy Air	151	100%	79.5%	0.5 min	2.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMI–ORD	Champaign/Urbana to Chicago	90	78.9%	0.2 min	1.1%
CMI–DFW	Champaign/Urbana to Dallas/Fort Worth	61	80.3%	0.9 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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	26.4%	33.0%	480
Late-arriving aircraft	31.6%	40.4%	575
National Aviation System	28.2%	20.5%	513
Extreme weather	13.7%	6.0%	249
Security	0.0%	0.1%	0

1,817 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 2026?

86.1% of 151 scheduled domestic departures left less than 15 minutes late, and 79.5% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 84.7% of 150 departures left on time and 0.0% were cancelled, against 86.1% and 2.0% in May 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2026; 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.