There are
2,181 mi
from San Marcos, CA to Mcdonough, GA
That's the driving distance. It would take 1 day 14 hours to go from San Marcos, California to Mcdonough, Georgia.
The flight distance (direct flight from San Marcos, CA to Mcdonough, GA) is 1,898.89 mi.
2,181 mi = 3.22 kms