ONT → ATL: cancellations & delays
Over Jan 2023 - Apr 2026, 1.5% of Ontario International Airport (ONT) to Hartsfield Jackson Atlanta International Airport (ATL) flights were cancelled and 10.1% arrived at least 15 minutes late, across 3,178 flights, flown by DL, F9. Cancellations peak in July.
Check today's live ONT departures →Airport pages: Ontario International Airport (ONT) · Hartsfield Jackson Atlanta International Airport (ATL)
Rates are historical averages from U.S. DOT (BTS) on-time records; a specific flight's live estimate can differ with weather and the day's disruptions.