There are
2,110 mi
from San Marcos, CA to Grafton, WI
That's the driving distance. It would take 1 day 13 hours to go from San Marcos, California to Grafton, Wisconsin.
The flight distance (direct flight from San Marcos, CA to Grafton, WI) is 1,722.80 mi.
2,110 mi = 3.22 kms