University of Illinois Willard Airport (CMI): Delays & On-Time Performance
Data through May 2026
University of Illinois Willard Airport (CMI) is a tale of two seasons: departures ran 95% on-time in October 2024 but sank to 71% in December 2025. Across the year it averages 83% against a national 78%, over roughly 5 departures a day to 2 destinations.
- Departures on-time
- 83%
- left <15 min late
- Avg dep delay
- 17 min
- Arrivals on-time
- 77%
- Cancelled
- 1.9%
- Destinations
- 2
- nonstop
- Airlines
- 1
Monthly on-time trend
Best time of day to depart from CMI
Busiest routes from CMI
| Route | Flights/12mo | On-time | Avg delay |
|---|---|---|---|
| CMI → ORD | 1,024 | 77% | 19 min |
| CMI → DFW | 728 | 84% | 17 min |
Frequently asked questions
- How often are flights delayed at CMI?
- 17% of departures from University of Illinois Willard Airport left 15+ minutes late between 2024-06 and 2026-05, with an average departure delay of 17 minutes. The national on-time average over the same period was 78%.
- What is the best time of day to depart from CMI?
- Flights scheduled around 7 a.m. depart on time 90% of the time at CMI, versus 68% around 6 p.m.. Booking before noon is the usual rule of thumb here.
- What is the worst month for delays at CMI?
- In this dataset, December 2025 was the weakest month at CMI, with 71% of departures on time.
- How often are flights cancelled at CMI?
- 1.9% of scheduled departures from CMI were cancelled in this period, compared with a national rate of 1.6%.
Popular route pages from this airport
Based on 3,160 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.