There are
1,418 mi
from Rapid City, SD to Ukiah, CA
That's the driving distance. It would take 1 day 1 hour to go from Rapid City, South Dakota to Ukiah, California.
The flight distance (direct flight from Rapid City, SD to Ukiah, CA) is 1,083.47 mi.
1,418 mi = 2,282.38 kms