There are
1,992 mi
from Walnut Creek, CA to Brownsville, TX
That's the driving distance. It would take 1 day 10 hours to go from Walnut Creek, California to Brownsville, Texas.
The flight distance (direct flight from Walnut Creek, CA to Brownsville, TX) is 1,655 mi.
1,992 mi = 3,205.66 kms