The calculated distance (air line) between Diamante and San Nicolás de los Arroyos is approximately 91 miles respectively 147 kilometers.
By car or train, the actual journey to San Nicolás de los Arroyos is certainly longer, as only the direct route (as the crow flies) between Diamante and San Nicolás de los Arroyos has been calculated here.
Air line (approximately)
147 kilometers
79 nautical miles