Cone Sul Aviação Agrícola Airport is a private aerodrome located in Chupinguaia, a municipality in the state of Rondônia, Brazil. It operates under the ICAO designator SI4Q and is associated with agricultural aviation services, primarily supporting crop-dusting and aerial application operations in the region. The airport serves the agribusiness sector of the western Brazilian agricultural frontier, where soybean and cattle farming have expanded significantly. It does not function as a commercial passenger facility and has no scheduled airline service.