There are
2,057 mi
from San Marcos, CA to Winnetka, IL
That's the driving distance. It would take 1 day 12 hours to go from San Marcos, California to Winnetka, Illinois.
The flight distance (direct flight from San Marcos, CA to Winnetka, IL) is 1,714.96 mi.
2,057 mi = 3.22 kms