Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Yankton (45% of total searches to South Dakota). The next most popular destinations are Hill City (27%) and Box Elder (18%). Searches for hotels in Rapid City (9%) are also popular.
KAYAK users have found double rooms in South Dakota for as cheap as €38 (Rapid City) in the last 3 days. The average price is €189.