There are
2,535 mi
from Walnut Creek, CA to Marietta, OH
That's the driving distance. It would take 1 day 20 hours to go from Walnut Creek, California to Marietta, Ohio.
The flight distance (direct flight from Walnut Creek, CA to Marietta, OH) is 2,174.90 mi.
2,535 mi = 4,079.52 kms