Decatur Airport (DEC) Delays and On-Time Departures
Decatur, IL · ranked 190th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, Decatur (DEC) had 627 scheduled departures and 79.9% of them left on time (US average 77.4%).
That ranks 190th of 333 US airports tracked on this site, with 5.4% of departures cancelled.
Over 24 months, Wednesday was the most reliable day (84% on time) and December the worst month (74%).
Best time of day to fly out of Decatur (DEC)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 9am–10am | 87.7% | 1.7% | 406 |
| 10am–11am | 79.3% | 0.0% | 58 |
| 11am–12pm | 83.9% | 0.0% | 124 |
| 2pm–3pm | 84.4% | 0.0% | 32 |
| 3pm–4pm | 79.5% | 1.2% | 168 |
| 5pm–6pm | Limited data | 22 | |
| 6pm–7pm | 80.9% | 6.1% | 229 |
| 7pm–8pm | 71.9% | 8.8% | 215 |
Airlines at DEC ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| SkyWest Airlines | 79.9% | 66.9% | 5.4% | 627 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of DEC
On-time departures by day, 24 months.
Best month to fly out of DEC
On-time departures by month, 24 months.
Holiday travel at Decatur (DEC)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 24 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 73.6% | -9.2 pts | 0.0% | 53 |
| Summer peak (Jun 15 - Aug 15) | 79.5% | -3.2 pts | 4.2% | 214 |
| All other days | 82.7% | — | 3.2% | 963 |
Monthly on-time departure trend at DEC
On-time departure % each month, with the 12-month US average for reference.
Routes from Decatur (DEC)
Every route from DEC with its own page, by number of flights (last 12 months, on-time arrivals).
| To | On time | Cancelled | Flights |
|---|---|---|---|
| DEC → Chicago (ORD) | 66.9% | 5.4% | 627 |