BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
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AIRLINE × ROUTE REPORT
ORD→ONT

United Airlines Chicago, IL (ORD) to Ontario, CA (ONT) reliability

Among 290 scheduled United Airlines flights from ORD to ONT, 58.3% arrived on time, 30.7% arrived at least 30 minutes late, and 1.0% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Marketing carrier: United Airlines (UA) · Updated September 16, 2026

HISTORICAL ROUTE SIGNALVariable
58.3%arrived on time
30.7%30+ min late
1.0%cancelled
290scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
30+ minutes late30.7%
60+ minutes late17.9%
Cancelled1.0%
Average arrival+27.7 mincompleted flights

What did United Airlines ORD to ONT record?

United Airlines completed 99.0% of its scheduled reportable ORD to ONT flights in the observation window. 58.3% of all scheduled flights arrived less than 15 minutes late, while 17.9% arrived at least an hour late.

What were United Airlines ORD to ONT disruption rates?

For United Airlines ORD-to-ONT flights, 30.7% arrived at least 30 minutes late, 1.0% were cancelled, and 0.0% were diverted.

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What was the United Airlines ORD to ONT scheduled cohort?

The United Airlines ORD-to-ONT cohort contained 290 scheduled flights; 287 completed, 3 were cancelled, and 0 were diverted.

Not a prediction.

This is a descriptive historical rate. Schedule changes, seasonal operations and current conditions may differ.