Best Time to Fly ORD to CHA: On-Time Stats by Hour & Airline
Chicago O'Hare International → Lovell Field
Data through July 2026 · Last updated October 18, 2026
956 flights were scheduled from Chicago (ORD) to Chattanooga (CHA) in the last 12 months, and 69.5% of those that flew arrived on time, 8.1 points below the US average of 77.6%.
Envoy Air was the most punctual of the 3 airlines on the route at 76.9%, while Republic Airways trailed at 65.1%.
May has been the best month (84% on time) and Sunday the weakest day of the week (62%).
5.0% of flights were cancelled, versus 1.8% nationally.
ORD to CHA 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 | 76.9% | 77 min | 3.4% | 206 |
| SkyWest Airlines | 68.8% | 78 min | 5.6% | 481 |
| Republic Airways | 65.1% | 84 min | 5.2% | 269 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to CHA
On-time arrival % by scheduled departure hour (local time), 1,670 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 75.0% | 6.2% | 64 |
| 8am–9am | 80.2% | 0.5% | 209 |
| 9am–10am | Limited data | 1 | |
| 10am–11am | 72.5% | 6.4% | 110 |
| 1pm–2pm | 71.9% | 2.3% | 131 |
| 2pm–3pm | 72.6% | 1.8% | 332 |
| 3pm–4pm | 70.1% | 2.8% | 141 |
| 5pm–6pm | 60.9% | 6.5% | 93 |
| 6pm–7pm | 71.8% | 1.6% | 191 |
| 7pm–8pm | 68.4% | 3.8% | 80 |
| 8pm–9pm | 73.9% | 3.6% | 251 |
| 9pm–10pm | 60.7% | 13.8% | 65 |
| 11pm–12am | Limited data | 2 | |
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 CHA
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) | 61.5% | -12.1 pts | 15.2% | 46 |
| Christmas & New Year (Dec 20 - Jan 3) | 67.7% | -6.0 pts | 0.0% | 68 |
| Summer peak (Jun 15 - Aug 15) | 62.9% | -10.8 pts | 3.1% | 128 |
| All other days | 73.7% | — | 3.1% | 1,428 |
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).