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

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

Among 291 scheduled United Airlines flights from ONT to ORD, 78.0% arrived on time, 12.7% arrived at least 30 minutes late, and 0.7% 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 SIGNALGenerally reliable
78.0%arrived on time
12.7%30+ min late
0.7%cancelled
291scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
30+ minutes late12.7%
60+ minutes late5.8%
Cancelled0.7%
Average arrival+9.9 mincompleted flights

What did United Airlines ONT to ORD record?

United Airlines completed 98.3% of its scheduled reportable ONT to ORD flights in the observation window. 78.0% of all scheduled flights arrived less than 15 minutes late, while 5.8% arrived at least an hour late.

What were United Airlines ONT to ORD disruption rates?

For United Airlines ONT-to-ORD flights, 12.7% arrived at least 30 minutes late, 0.7% were cancelled, and 1.0% were diverted.

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What was the United Airlines ONT to ORD scheduled cohort?

The United Airlines ONT-to-ORD cohort contained 291 scheduled flights; 286 completed, 2 were cancelled, and 3 were diverted.

Not a prediction.

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