There are
1,756 mi
from Walnut Creek, CA to Round Rock, TX
That's the driving distance. It would take 1 day 6 hours to go from Walnut Creek, California to Round Rock, Texas.
The flight distance (direct flight from Walnut Creek, CA to Round Rock, TX) is 1,478.90 mi.
1,756 mi = 2,826.24 kms