There are
2,209 mi
from San Marcos, CA to Springboro, OH
That's the driving distance. It would take 1 day 15 hours to go from San Marcos, California to Springboro, Ohio.
The flight distance (direct flight from San Marcos, CA to Springboro, OH) is 1,874.20 mi.
2,209 mi = 3,554.65 kms