Nonstop flights from Chicago to Ontario

2 airlines fly from 2 Chicago airports (MDW and ORD) to Ontario (ONT), with up to 2 flights a day.

MDWONT

Routes

2 airport pairs

Chicago time

2:00p9:25pFirst departure 2:00 PM, last 9:25 PM

One afternoon flight at 2:00 PM, then two in the evening, 8:18 PM to 9:25 PM.

Earliest first

2:00 PM→4:10 PMMDW to ONTSouthwest AirlinesBoeing 737 MAX 8Mon, Tue, Wed, Thu, Fri, Sat
8:18 PM→10:51 PMORD to ONTUnited AirlinesBoeing 737Daily
9:25 PM→11:35 PMMDW to ONTSouthwest AirlinesBoeing 737 MAX 8Sun

Schedules last checked Sep 19, 2026. Times are local.

Southwest Airlines flies daily on the Boeing 737 MAX 8. United Airlines flies daily on the Boeing 737.

There are 2 flights every day of the week. The first arrival in Ontario is at 4:10 PM and the last at 11:35 PM.

MDW to ONT is the busiest airport pair, with 7 flights a week, then ORD to ONT with 7.

Flying back, Ontario to Chicago has 14 nonstop flights a week.

Schedules as of Oct 9, 2026.