BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
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DEN→ONT

Southwest Airlines Denver, CO (DEN) to Ontario, CA (ONT) reliability

Among 1,267 scheduled Southwest Airlines flights from DEN to ONT, 67.9% arrived on time, 19.2% arrived at least 30 minutes late, and 0.2% were cancelled during July 2025–June 2026.

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

HISTORICAL ROUTE SIGNALVariable
67.9%arrived on time
19.2%30+ min late
0.2%cancelled
1,267scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
30+ minutes late19.2%
60+ minutes late8.4%
Cancelled0.2%
Average arrival+12.2 mincompleted flights

What did Southwest Airlines DEN to ONT record?

Southwest Airlines completed 99.8% of its scheduled reportable DEN to ONT flights in the observation window. 67.9% of all scheduled flights arrived less than 15 minutes late, while 8.4% arrived at least an hour late.

What were Southwest Airlines DEN to ONT disruption rates?

For Southwest Airlines DEN-to-ONT flights, 19.2% arrived at least 30 minutes late, 0.2% were cancelled, and 0.0% were diverted.

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What was the Southwest Airlines DEN to ONT scheduled cohort?

The Southwest Airlines DEN-to-ONT cohort contained 1,267 scheduled flights; 1,265 completed, 2 were cancelled, and 0 were diverted.

Not a prediction.

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