The calculated distance (air line) between Santos Dumont and Duque de Caxias is approximately 93 miles respectively 150 kilometers.
By car or train, the actual journey to Duque de Caxias is certainly longer, as only the direct route (as the crow flies) between Santos Dumont and Duque de Caxias has been calculated here.
Air line (approximately)
150 kilometers
81 nautical miles