The calculated distance (air line) between San Salvador and San Nicolás de los Arroyos is approximately 154 miles respectively 248 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 San Salvador and San Nicolás de los Arroyos has been calculated here.
Air line (approximately)
248 kilometers
134 nautical miles