There are
2,196 mi
from San Marcos, CA to Loveland, OH
That's the driving distance. It would take 1 day 14 hours to go from San Marcos, California to Loveland, Ohio.
The flight distance (direct flight from San Marcos, CA to Loveland, OH) is 1,871.55 mi.
2,196 mi = 3,534.88 kms