Central and southern Brazil, eastern Paraguay (Oriente) and northern Argentina (Misiones); may also breed in Serranía de Huanchaca, north-eastern Bolivia, where recently recorded.
 
Population
Estimated population is unknown (2010).
Great Dusky Swift (Cypseloides senex) [XC500223]
by id from Parque Nacional da Serra da Canastra, S\u00e3o Roque de Minas, Minas Gerais, Brazil (call, song)
Great Dusky Swift (Cypseloides senex) [XC299148]
by Juan Mazar Barnett from Itarar\u00e9, S\u00e3o Paulo, Brazil (flight call)