The calculated distance (air line) between Concordia and San Nicolás de los Arroyos is approximately 185 miles respectively 298 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 Concordia and San Nicolás de los Arroyos has been calculated here.
Air line (approximately)
298 kilometers
161 nautical miles