You can get to Custer by both car and air. A small general aviation airport is located in Custer for small and private planes. The nearest commercial airport is located in Rapid City. The Rapid City Regional Airport is serviced by Northwest, Delta, United and Allegiant Airlines.
If you are coming to Custer in a car, the major highways are U.S. 16, 16A and US Highway 3. Custer is also accessible by South Dakota Highway 85, 89 and 87.