University of Illinois/Willard in September 2025

89.8%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 September 2025, reporting carriers scheduled 128 domestic departures from University of Illinois/Willard (CMI). 89.8% left less than 15 minutes late and 85.9% reached their destination on time; 0.8% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so CMI departures were 6.7 points above the national departure figure.

A year earlier, in September 2024, the airport had 117 departures with 82.1% leaving on time: a change of +7.7 points, with flights up 9%.

Flights arriving at CMI that month were on time 85.9% of the time (128 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 49%, national aviation system 32% and air carrier 18%.

On time 85.9%
Arrived 15+ minutes late 12.5%
Cancelled 0.8%
Diverted 0.8%

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

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

Measure	Sep 2025	Sep 2024	CMI, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	89.8%	82.1%	79.7%	83.1%
Arrived on time	85.9%	77.8%	77.6%	82.8%
Cancelled	0.8%	0.0%	3.0%	0.5%
Average departure delay (late minutes only)	8.1 min	28.7 min	18.0 min	12.2 min
Scheduled departures a day	4	4	5	18,748
Scheduled departures	128	117	1,785	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
MQ Envoy Air	128	100%	85.9%	-5.0 min	0.8%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMI–ORD	Champaign/Urbana to Chicago	68	83.8%	0.2 min	0.0%
CMI–DFW	Champaign/Urbana to Dallas/Fort Worth	60	88.3%	-11.1 min	1.7%

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), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	18.2%	34.3%	201
Late-arriving aircraft	49.4%	37.4%	546
National Aviation System	31.8%	22.6%	352
Extreme weather	0.6%	5.6%	7
Security	0.0%	0.1%	0

1,106 delay minutes on 16 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 September 2025?

89.8% of 128 scheduled domestic departures left less than 15 minutes late, and 85.9% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 82.1% of 117 departures left on time and 0.0% were cancelled, against 89.8% and 0.8% in September 2025.

Provenance

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