There are
2,503 mi
from Greensboro, NC to San Marcos, CA
That's the driving distance. It would take 1 day 19 hours to go from Greensboro, North Carolina to San Marcos, California.
The flight distance (direct flight from Greensboro, NC to San Marcos, CA) is 2,121.99 mi.
2,503 mi = 3.22 kms