There are
1,392 mi
from Rapid City, SD to Larkspur, CA
That's the driving distance. It would take 1 day to go from Rapid City, South Dakota to Larkspur, California.
The flight distance (direct flight from Rapid City, SD to Larkspur, CA) is 1,089.07 mi.
1,392 mi = 2,240.75 kms