The calculated distance (air line) between Humahuaca and San Salvador de Jujuy is approximately 68 miles respectively 110 kilometers.
By car or train, the actual journey to San Salvador de Jujuy is certainly longer, as only the direct route (as the crow flies) between Humahuaca and San Salvador de Jujuy has been calculated here.
Air line (approximately)
110 kilometers
59 nautical miles