University of Illinois/Willard in September 2024

82.1%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 September 2024, reporting carriers scheduled 117 domestic departures from University of Illinois/Willard (CMI). 82.1% left less than 15 minutes late and 77.8% reached their destination on time; 0.0% were cancelled.

Nationally that month, 84.4% of flights departed on time and 83.9% arrived on time, so CMI departures were 2.3 points below the national departure figure.

A year earlier, in September 2023, the airport had 93 departures with 87.1% leaving on time: a change of −5.0 points, with flights up 26%.

Flights arriving at CMI that month were on time 81.2% of the time (117 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 61%, air carrier 21% and national aviation system 10%.

On time 77.8%
Arrived 15+ minutes late 22.2%
Cancelled 0.0%
Diverted 0.0%

Every scheduled departure from CMI in September 2024, judged by arrival at the destination.

September 2024 against a year earlier, the airport's year and the nation

Measure	Sep 2024	Sep 2023	CMI, 12 months to Jul 2026	All reported flights, Sep 2024
Departed on time	82.1%	87.1%	79.7%	84.4%
Arrived on time	77.8%	84.9%	77.6%	83.9%
Cancelled	0.0%	0.0%	3.0%	0.6%
Average departure delay (late minutes only)	28.7 min	12.2 min	18.0 min	10.6 min
Scheduled departures a day	4	3	5	19,421
Scheduled departures	117	93	1,785	582,622

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
MQ Envoy Air	117	100%	77.8%	18.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
CMI–ORD	Champaign/Urbana to Chicago	60	73.3%	34.6 min	0.0%
CMI–DFW	Champaign/Urbana to Dallas/Fort Worth	57	82.5%	1.1 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), September 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2024	Minutes
Air carrier	21.1%	38.6%	696
Late-arriving aircraft	60.5%	38.4%	1,994
National Aviation System	10.1%	18.2%	333
Extreme weather	8.3%	4.8%	275
Security	0.0%	0.1%	0

3,298 delay minutes on 26 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 2024?

82.1% of 117 scheduled domestic departures left less than 15 minutes late, and 77.8% reached their destination on time. The national figures that month were 84.4% and 83.9%.

How does that compare with a year earlier?

In September 2023, 87.1% of 93 departures left on time and 0.0% were cancelled, against 82.1% and 0.0% in September 2024.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2024; 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.