There are
630 mi
from Walnut Creek, CA to Mesquite, NV
That's the driving distance. It would take 11 hours 32 mins to go from Walnut Creek, California to Mesquite, Nevada.
The flight distance (direct flight from Walnut Creek, CA to Mesquite, NV) is 445.65 mi.
630 mi = 1,013.74 kms