There are
2,956 mi
from Stamford, CT to San Mateo, CA
That's the driving distance. It would take 2 days 4 hours to go from Stamford, Connecticut to San Mateo, California.
The flight distance (direct flight from Stamford, CT to San Mateo, CA) is 2,585.34 mi.
2,956 mi = 3.22 kms