There are
2,569 mi
from San Marcos, CA to Harrisonburg, VA
That's the driving distance. It would take 1 day 21 hours to go from San Marcos, California to Harrisonburg, Virginia.
The flight distance (direct flight from San Marcos, CA to Harrisonburg, VA) is 2,161.51 mi.
2,569 mi = 3.22 kms