The calculated distance (air line) between Merlo and San Nicolás de los Arroyos is approximately 125 miles respectively 202 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 Merlo and San Nicolás de los Arroyos has been calculated here.
Air line (approximately)
202 kilometers
109 nautical miles