The calculated distance (air line) between Monforte de Lemos and Santiago de Compostela is approximately 58 miles respectively 93 kilometers.
By car or train, the actual journey to Santiago de Compostela is certainly longer, as only the direct route (as the crow flies) between Monforte de Lemos and Santiago de Compostela has been calculated here.
Air line (approximately)
93 kilometers
50 nautical miles