Miles between Ontario, CA and Lake Forest, IL

There are
1,998 mi
from Ontario, CA to Lake Forest, IL

That's the driving distance. It would take 1 day 11 hours to go from Ontario, California to Lake Forest, Illinois.

The flight distance (direct flight from Ontario, CA to Lake Forest, IL) is 1,705.20 mi.

1,998 mi = 1.61 kms