There are
2,759 mi
from Greensboro, NC to San Mateo, CA
That's the driving distance. It would take 2 days to go from Greensboro, North Carolina to San Mateo, California.
The flight distance (direct flight from Greensboro, NC to San Mateo, CA) is 2,334.69 mi.
2,759 mi = 4,440.52 kms