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