Best Time to Fly ORD to DEC: On-Time Stats by Hour & Airline
Chicago O'Hare International → Decatur Airport
Data through July 2026 · Last updated October 18, 2026
627 flights were scheduled from Chicago (ORD) to Decatur (DEC) in the last 12 months, and 69.6% of those that flew arrived on time, 8.1 points below the US average of 77.6%.
SkyWest Airlines was the only reporting airline with regular flights on this route.
October has been the best month (89% on time) and Sunday the weakest day of the week (68%).
4.3% of flights were cancelled, versus 1.8% nationally.
ORD to DEC 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 | 69.6% | 88 min | 4.3% | 627 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to DEC
On-time arrival % by scheduled departure hour (local time), 1,254 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 80.9% | 1.3% | 464 |
| 9am–10am | 75.0% | 0.0% | 124 |
| 12pm–1pm | 87.1% | 3.1% | 32 |
| 1pm–2pm | 73.5% | 1.2% | 168 |
| 3pm–4pm | 67.4% | 0.0% | 47 |
| 4pm–5pm | 63.0% | 5.5% | 380 |
| 5pm–6pm | 52.6% | 2.6% | 39 |
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 DEC
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) | 62.3% | -11.9 pts | 0.0% | 53 |
| Summer peak (Jun 15 - Aug 15) | 71.3% | -2.9 pts | 2.3% | 214 |
| All other days | 74.2% | — | 2.5% | 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).