There are
1,746 mi
from Rapid City, SD to Danbury, CT
That's the driving distance. It would take 1 day 7 hours to go from Rapid City, South Dakota to Danbury, Connecticut.
The flight distance (direct flight from Rapid City, SD to Danbury, CT) is 1,514.07 mi.
1,746 mi = 2,810.37 kms