The calculated distance (air line) between Buenos Aires and San Nicolás de los Arroyos is approximately 137 miles respectively 221 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 Buenos Aires and San Nicolás de los Arroyos has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles