Southwest Airlines Ontario, CA (ONT) to Chicago, IL (MDW) reliability

Among 360 scheduled Southwest Airlines flights from ONT to MDW, 89.2% arrived on time, 5.3% arrived at least 30 minutes late, and 0.3% 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 SIGNALLower disruption

89.2%arrived on time

5.3%30+ min late

0.3%cancelled

360scheduled flights

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

30+ minutes late5.3%

60+ minutes late1.9%

Cancelled0.3%

Average arrival-3.2 mincompleted flights

What did Southwest Airlines ONT to MDW record?

Southwest Airlines completed 99.2% of its scheduled reportable ONT to MDW flights in the observation window. 89.2% of all scheduled flights arrived less than 15 minutes late, while 1.9% arrived at least an hour late.

What were Southwest Airlines ONT to MDW disruption rates?

For Southwest Airlines ONT-to-MDW flights, 5.3% arrived at least 30 minutes late, 0.3% were cancelled, and 0.6% were diverted.

Compare all airlines on this route

What was the Southwest Airlines ONT to MDW scheduled cohort?

The Southwest Airlines ONT-to-MDW cohort contained 360 scheduled flights; 357 completed, 1 were cancelled, and 2 were diverted.

Not a prediction.

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