There are
2,432 mi
from Walnut Creek, CA to Westlake, OH
That's the driving distance. It would take 1 day 18 hours to go from Walnut Creek, California to Westlake, Ohio.
The flight distance (direct flight from Walnut Creek, CA to Westlake, OH) is 2,129.65 mi.
2,432 mi = 3,913.54 kms