Keystone is not equipped with any airports. Rapid City Regional Airport and the Sioux Falls Regional Airport are the airports that are nearby. Among the two, Rapid City Regional Airport is the closest and helps in reaching Keystone. From the airport, you have to get into a taxi or a bus.
HOW TO GET AROUND KEYSTONE
Getting around Keystone is very difficult given the poor transportation infrastructure. Renting a bike or a car is one of the few options available.