There are
1,742 mi
from San Mateo, CA to Forney, TX
That's the driving distance. It would take 1 day 7 hours to go from San Mateo, California to Forney, Texas.
The flight distance (direct flight from San Mateo, CA to Forney, TX) is 1,492.80 mi.
1,742 mi = 1.61 kms