There are
1,989 mi
from Brownsville, TX to Walnut Creek, CA
That's the driving distance. It would take 1 day 10 hours to go from Brownsville, Texas to Walnut Creek, California.
The flight distance (direct flight from Brownsville, TX to Walnut Creek, CA) is 1,655 mi.
1,989 mi = 1.61 kms