There are
1,745 mi
from South San Francisco, CA to Forney, TX
That's the driving distance. It would take 1 day 6 hours to go from South San Francisco, California to Forney, Texas.
The flight distance (direct flight from South San Francisco, CA to Forney, TX) is 1,497.84 mi.
1,745 mi = 2,808.44 kms