There are
2,412 mi
from Walnut Creek, CA to Niceville, FL
That's the driving distance. It would take 1 day 19 hours to go from Walnut Creek, California to Niceville, Florida.
The flight distance (direct flight from Walnut Creek, CA to Niceville, FL) is 2,082.68 mi.
2,412 mi = 3,881.45 kms