There are
1,703 mi
from Rapid City, SD to Cayce, SC
That's the driving distance. It would take 1 day 6 hours to go from Rapid City, South Dakota to Cayce, South Carolina.
The flight distance (direct flight from Rapid City, SD to Cayce, SC) is 1,372.94 mi.
1,703 mi = 2,740.96 kms