There are
2,560 mi
from San Mateo, CA to Alpena, MI
That's the driving distance. It would take 1 day 20 hours to go from San Mateo, California to Alpena, Michigan.
The flight distance (direct flight from San Mateo, CA to Alpena, MI) is 2,062.48 mi.
2,560 mi = 3.22 kms