Southwest Airlines departures from Ontario, CA (ONT)

Among 11,651 scheduled Southwest Airlines flights departing ONT, 81.1% arrived on time, 10.7% arrived at least 30 minutes late, and 0.4% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Origin and marketing-carrier cohort · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption

81.1%arrived on time

10.7%30+ min late

0.4%cancelled

11,651scheduled flights

Based on July 2025–June 2026; on time means arrival less than 15 minutes late.

30+ minutes late10.7%

60+ minutes late4.8%

Cancelled0.4%

Diverted0.1%

What does the Southwest Airlines ONT sample show?

Southwest Airlines completed 99.5% of its scheduled departures from ONT; 4.8% arrived at least one hour late and 0.1% were diverted.

What were Southwest Airlines at ONT disruption rates?

For Southwest Airlines departures from ONT, 10.7% arrived at least 30 minutes late, 0.4% were cancelled, and 0.1% were diverted.

Compare all airlines at ONT

How large was the Southwest Airlines cohort at ONT?

The Southwest Airlines cohort at ONT contained 11,651 scheduled flights, including 11,593 completed flights, 45 cancellations, and 13 diversions.