There are
2,085 mi
from San Marcos, CA to Caledonia, WI
That's the driving distance. It would take 1 day 12 hours to go from San Marcos, California to Caledonia, Wisconsin.
The flight distance (direct flight from San Marcos, CA to Caledonia, WI) is 1,715.87 mi.
2,085 mi = 3,355.28 kms