There are
1,769 mi
from Rapid City, SD to Ansonia, CT
That's the driving distance. It would take 1 day 7 hours to go from Rapid City, South Dakota to Ansonia, Connecticut.
The flight distance (direct flight from Rapid City, SD to Ansonia, CT) is 1,533.64 mi.
1,769 mi = 2,846.78 kms