IAH → ONT: cancellations & delays
Over Jan 2023 - Apr 2026, 1.2% of George Bush Intercontinental Airport (IAH) to Ontario International Airport (ONT) flights were cancelled and 33.7% arrived at least 15 minutes late, across 1,036 flights, flown by UA, F9. Cancellations peak in July.
Check today's live IAH departures →Airport pages: George Bush Intercontinental Airport (IAH) · Ontario International Airport (ONT)
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.