Best Time to Fly CMH to ATL: On-Time Stats by Hour & Airline
John Glenn Columbus International → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 85.3% of Columbus (CMH) to Atlanta (ATL) flights arrived on time (3,155 scheduled flights). That is 7.7 points above the national average of 77.6%.
Among 3 airlines, Delta Air Lines led with 87.4% on time and Frontier Airlines was last with 52.6%.
Over 24 months, Wednesday was the most reliable day (91% on time) and July the worst month (78%).
The cancellation rate was 1.6% (US average 1.8%).
CMH 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 | 87.4% | 92 min | 1.6% | 2,694 |
| Southwest Airlines | 82.1% | 48 min | 0.9% | 322 |
| Frontier Airlines | 52.6% | 67 min | 2.9% | 139 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly CMH to ATL
On-time arrival % by scheduled departure hour (local time), 6,395 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.2% | 0.0% | 78 |
| 6am–7am | 93.4% | 1.5% | 875 |
| 7am–8am | 89.4% | 1.1% | 574 |
| 8am–9am | 86.5% | 0.8% | 629 |
| 9am–10am | 91.7% | 1.6% | 247 |
| 10am–11am | 93.4% | 1.8% | 339 |
| 11am–12pm | 85.7% | 1.0% | 296 |
| 12pm–1pm | 83.8% | 1.4% | 664 |
| 1pm–2pm | 85.8% | 1.2% | 343 |
| 2pm–3pm | 77.8% | 0.6% | 333 |
| 3pm–4pm | 89.0% | 0.4% | 265 |
| 4pm–5pm | 82.4% | 0.6% | 477 |
| 5pm–6pm | 79.3% | 1.4% | 359 |
| 6pm–7pm | 74.0% | 1.0% | 579 |
| 7pm–8pm | 77.8% | 1.2% | 251 |
| 8pm–9pm | 73.5% | 0.0% | 83 |
| 9pm–10pm | Limited data | 3 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on CMH 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) | 81.6% | -5.2 pts | 0.0% | 114 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.0% | -11.8 pts | 1.3% | 239 |
| Summer peak (Jun 15 - Aug 15) | 81.5% | -5.3 pts | 1.7% | 1,192 |
| All other days | 86.8% | — | 1.0% | 4,850 |
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).