Best Time to Fly CMI to ORD: On-Time Stats by Hour & Airline
University of Illinois/Willard → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 75.9% of Champaign/Urbana (CMI) to Chicago (ORD) flights arrived on time (1,066 scheduled flights). That is 1.8 points below the national average of 77.6%.
Envoy Air was the only reporting airline with regular flights on this route.
Over 24 months, Saturday was the most reliable day (82% on time) and December the worst month (70%).
The cancellation rate was 3.6% (US average 1.8%).
CMI to ORD 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 | 75.9% | 86 min | 3.6% | 1,066 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly CMI to ORD
On-time arrival % by scheduled departure hour (local time), 1,775 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 25 | |
| 6am–7am | 85.0% | 1.4% | 562 |
| 7am–8am | 86.8% | 0.0% | 53 |
| 9am–10am | 74.5% | 4.1% | 49 |
| 10am–11am | Limited data | 1 | |
| 11am–12pm | 81.9% | 0.6% | 350 |
| 12pm–1pm | 81.2% | 1.4% | 70 |
| 1pm–2pm | 63.2% | 3.4% | 59 |
| 2pm–3pm | 76.6% | 0.6% | 159 |
| 3pm–4pm | 57.1% | 8.7% | 46 |
| 4pm–5pm | 71.6% | 1.2% | 82 |
| 5pm–6pm | 61.3% | 0.0% | 31 |
| 6pm–7pm | 67.1% | 7.3% | 177 |
| 7pm–8pm | 50.9% | 9.5% | 63 |
| 8pm–9pm | 58.5% | 14.6% | 48 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on CMI to ORD
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) | 70.6% | -7.8 pts | 7.3% | 55 |
| Summer peak (Jun 15 - Aug 15) | 74.7% | -3.7 pts | 2.8% | 317 |
| All other days | 78.4% | — | 2.1% | 1,372 |
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).