There are
2,392 mi
from San Mateo, CA to Erlanger, KY
That's the driving distance. It would take 1 day 17 hours to go from San Mateo, California to Erlanger, Kentucky.
The flight distance (direct flight from San Mateo, CA to Erlanger, KY) is 2,033.63 mi.
2,392 mi = 3.22 kms