Miles between Union City, CA and San Mateo, CA

There are
21 mi
from Union City, CA to San Mateo, CA

That's the driving distance. It would take 26 minutes to go from Union City, California to San Mateo, California.

The flight distance (direct flight from Union City, CA to San Mateo, CA) is 15.46 mi.

21 mi = 33.43 kms