Best Time to Fly DEC to ORD: On-Time Stats by Hour & Airline
Decatur Airport → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 66.9% of Decatur (DEC) to Chicago (ORD) flights arrived on time (627 scheduled flights). That is 10.7 points below the national average of 77.6%.
SkyWest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Monday was the most reliable day (77% on time) and June the worst month (65%).
The cancellation rate was 5.4% (US average 1.8%).
DEC 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 |
|---|---|---|---|---|
| SkyWest Airlines | 66.9% | 95 min | 5.4% | 627 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEC to ORD
On-time arrival % by scheduled departure hour (local time), 1,254 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 9am–10am | 81.9% | 1.7% | 406 |
| 10am–11am | 74.1% | 0.0% | 58 |
| 11am–12pm | 79.0% | 0.0% | 124 |
| 2pm–3pm | 81.2% | 0.0% | 32 |
| 3pm–4pm | 77.1% | 1.2% | 168 |
| 5pm–6pm | Limited data | 22 | |
| 6pm–7pm | 57.7% | 6.1% | 229 |
| 7pm–8pm | 56.6% | 8.8% | 215 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEC 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 | 24 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 73.1% | +0.1 pts | 0.0% | 53 |
| Summer peak (Jun 15 - Aug 15) | 67.7% | -5.3 pts | 4.2% | 214 |
| All other days | 73.0% | — | 3.2% | 963 |
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).