There are
1,695 mi
from Lewisville, TX to Walnut Creek, CA
That's the driving distance. It would take 1 day 6 hours to go from Lewisville, Texas to Walnut Creek, California.
The flight distance (direct flight from Lewisville, TX to Walnut Creek, CA) is 1,445.29 mi.
1,695 mi = 1.61 kms