Best Time to Fly ORD to ATL: On-Time Stats by Hour & Airline
Chicago O'Hare International → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
6,442 flights were scheduled from Chicago (ORD) to Atlanta (ATL) in the last 12 months, and 75.3% of those that flew arrived on time, 2.3 points below the US average of 77.6%.
Delta Air Lines was the most punctual of the 8 airlines on the route at 80.5%, while SkyWest Airlines trailed at 61.5%.
September has been the best month (84% on time) and Friday the weakest day of the week (72%).
2.3% of flights were cancelled, versus 1.8% nationally.
ORD to ATL 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 |
|---|---|---|---|---|
| Delta Air Lines | 80.5% | 84 min | 2.5% | 2,628 |
| Envoy Air | 77.6% | 62 min | 2.2% | 365 |
| Spirit Airlines | 75.6% | 127 min | 0.0% | 45 |
| United Airlines | 75.2% | 67 min | 1.3% | 1,668 |
| Republic Airways | 70.4% | 64 min | 4.6% | 305 |
| Frontier Airlines | 68.2% | 102 min | 3.5% | 715 |
| American Airlines | 64.6% | 88 min | 2.4% | 671 |
| SkyWest Airlines | 61.5% | 93 min | 2.5% | 40 |
| PSA Airlines | Limited data | 5 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to ATL
On-time arrival % by scheduled departure hour (local time), 12,368 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 1 | |
| 5am–6am | 83.3% | 2.0% | 832 |
| 6am–7am | 86.4% | 1.7% | 532 |
| 7am–8am | 85.0% | 1.4% | 1,434 |
| 8am–9am | 82.9% | 1.7% | 541 |
| 9am–10am | 86.4% | 1.3% | 1,034 |
| 10am–11am | 84.1% | 0.5% | 835 |
| 11am–12pm | 77.9% | 1.9% | 779 |
| 12pm–1pm | 72.1% | 1.3% | 310 |
| 1pm–2pm | 77.1% | 1.1% | 817 |
| 2pm–3pm | 73.9% | 1.6% | 1,080 |
| 3pm–4pm | 71.8% | 0.7% | 541 |
| 4pm–5pm | 67.5% | 4.7% | 516 |
| 5pm–6pm | 66.4% | 1.9% | 670 |
| 6pm–7pm | 60.7% | 2.4% | 1,519 |
| 7pm–8pm | 65.2% | 3.5% | 459 |
| 8pm–9pm | 69.5% | 2.4% | 420 |
| 9pm–10pm | 45.2% | 6.1% | 33 |
| 10pm–11pm | Limited data | 14 | |
| 11pm–12am | Limited data | 1 | |
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 ATL
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) | 68.5% | -9.6 pts | 4.4% | 227 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.7% | -4.4 pts | 1.9% | 414 |
| Summer peak (Jun 15 - Aug 15) | 68.5% | -9.6 pts | 2.5% | 2,310 |
| All other days | 78.1% | — | 1.6% | 9,417 |
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).