There are
1,374 mi
from Rapid City, SD to Clearlake, CA
That's the driving distance. It would take 1 day to go from Rapid City, South Dakota to Clearlake, California.
The flight distance (direct flight from Rapid City, SD to Clearlake, CA) is 1,060.88 mi.
1,374 mi = 2,210.69 kms