There are
2,023 mi
from San Marcos, CA to Crest Hill, IL
That's the driving distance. It would take 1 day 11 hours to go from San Marcos, California to Crest Hill, Illinois.
The flight distance (direct flight from San Marcos, CA to Crest Hill, IL) is 1,689.30 mi.
2,023 mi = 3.22 kms