There are
2,022 mi
from San Marcos, CA to Lake In The Hills, IL
That's the driving distance. It would take 1 day 11 hours to go from San Marcos, California to Lake In The Hills, Illinois.
The flight distance (direct flight from San Marcos, CA to Lake In The Hills, IL) is 1,686.19 mi.
2,022 mi = 3.22 kms