There are
2,327 mi
from San Mateo, CA to Portland, TN
That's the driving distance. It would take 1 day 16 hours to go from San Mateo, California to Portland, Tennessee.
The flight distance (direct flight from San Mateo, CA to Portland, TN) is 1,963.26 mi.
2,327 mi = 3,744.85 kms