There are
1,997 mi
from San Mateo, CA to Brownsville, TX
That's the driving distance. It would take 1 day 10 hours to go from San Mateo, California to Brownsville, Texas.
The flight distance (direct flight from San Mateo, CA to Brownsville, TX) is 1,659.16 mi.
1,997 mi = 1.61 kms