Hartsfield-Jackson Atlanta International (ATL) Delays and On-Time Departures
Atlanta, GA · ranked 234th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, Atlanta (ATL) had 315,859 scheduled departures and 78.4% of them left on time (US average 77.4%).
That ranks 234th of 333 US airports tracked on this site, with 1.8% of departures cancelled.
Among airlines at Atlanta (ATL), United Airlines left on time most often (82.4%).
Over 24 months, Wednesday was the most reliable day (83% on time) and July the worst month (68%).
Best time of day to fly out of Atlanta (ATL)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 85.0% | 2.3% | 4,084 |
| 6am–7am | 89.1% | 2.1% | 11,213 |
| 7am–8am | 89.3% | 1.6% | 29,763 |
| 8am–9am | 89.1% | 1.4% | 49,442 |
| 9am–10am | 84.9% | 1.4% | 48,682 |
| 10am–11am | 82.9% | 1.4% | 37,874 |
| 11am–12pm | 83.4% | 1.3% | 43,829 |
| 12pm–1pm | 82.3% | 1.0% | 35,604 |
| 1pm–2pm | 81.0% | 1.1% | 31,653 |
| 2pm–3pm | 77.8% | 1.3% | 33,027 |
| 3pm–4pm | 75.1% | 1.4% | 46,108 |
| 4pm–5pm | 72.5% | 1.4% | 39,675 |
| 5pm–6pm | 72.2% | 1.5% | 32,820 |
| 6pm–7pm | 70.1% | 1.6% | 31,345 |
| 7pm–8pm | 70.0% | 1.6% | 42,511 |
| 8pm–9pm | 68.4% | 1.7% | 34,010 |
| 9pm–10pm | 72.0% | 1.8% | 38,570 |
| 10pm–11pm | 73.8% | 2.0% | 44,112 |
| 11pm–12am | 73.0% | 2.1% | 8,163 |
Airlines at ATL 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 |
|---|---|---|---|---|
| United Airlines | 82.4% | 80.2% | 1.5% | 7,595 |
| Delta Air Lines | 80.7% | 79.9% | 1.7% | 240,720 |
| Envoy Air | 78.8% | 72.5% | 2.4% | 1,112 |
| Alaska Airlines | 78.1% | 77.5% | 0.8% | 1,395 |
| Republic Airways | 77.2% | 75.5% | 4.7% | 3,002 |
| PSA Airlines | 76.8% | 78.4% | 4.8% | 3,307 |
| SkyWest Airlines | 76.4% | 74.8% | 2.4% | 6,955 |
| American Airlines | 75.5% | 76.4% | 2.0% | 6,801 |
| Southwest Airlines | 71.3% | 76.9% | 1.0% | 17,479 |
| Spirit Airlines | 69.5% | 71.6% | 3.5% | 4,513 |
| JetBlue | 69.3% | 69.6% | 3.9% | 2,699 |
| Frontier Airlines | 61.1% | 64.2% | 2.4% | 20,281 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of ATL
On-time departures by day, 24 months.
Best month to fly out of ATL
On-time departures by month, 24 months.
Holiday travel at Atlanta (ATL)
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) | 77.2% | -3.2 pts | 0.4% | 12,687 |
| Christmas & New Year (Dec 20 - Jan 3) | 71.7% | -8.7 pts | 1.6% | 24,615 |
| Summer peak (Jun 15 - Aug 15) | 70.4% | -10.0 pts | 2.1% | 114,251 |
| All other days | 80.4% | — | 1.4% | 490,932 |
Monthly on-time departure trend at ATL
On-time departure % each month, with the 12-month US average for reference.
Routes from Atlanta (ATL)
Every route from ATL with its own page, by number of flights (last 12 months, on-time arrivals).