Best Time to Fly ORD to CMI: On-Time Stats by Hour & Airline
Chicago O'Hare International → University of Illinois/Willard
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 72.6% of Chicago (ORD) to Champaign/Urbana (CMI) flights arrived on time (1,066 scheduled flights). That is 5.0 points below the national average of 77.6%.
Envoy Air was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (79% on time) and January the worst month (58%).
The cancellation rate was 3.7% (US average 1.8%).
ORD to CMI on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Envoy Air | 72.6% | 64 min | 3.7% | 1,066 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to CMI
On-time arrival % by scheduled departure hour (local time), 1,773 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 73.3% | 4.3% | 47 |
| 9am–10am | 81.0% | 0.7% | 281 |
| 10am–11am | 71.4% | 0.8% | 134 |
| 11am–12pm | 61.8% | 2.9% | 35 |
| 12pm–1pm | 93.3% | 2.2% | 46 |
| 1pm–2pm | 79.2% | 0.0% | 120 |
| 2pm–3pm | 80.3% | 2.7% | 146 |
| 3pm–4pm | Limited data | 5 | |
| 4pm–5pm | 86.3% | 3.8% | 53 |
| 5pm–6pm | 65.5% | 2.9% | 210 |
| 6pm–7pm | 72.6% | 11.6% | 95 |
| 7pm–8pm | 60.4% | 2.0% | 147 |
| 8pm–9pm | 70.2% | 3.1% | 454 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD to CMI
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 31 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 64.7% | -10.2 pts | 7.3% | 55 |
| Summer peak (Jun 15 - Aug 15) | 70.2% | -4.7 pts | 2.5% | 317 |
| All other days | 74.9% | — | 2.2% | 1,370 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).