The calculated distance (air line) between Rosario and San Nicolás de los Arroyos is approximately 36 miles respectively 59 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 Rosario and San Nicolás de los Arroyos has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles