The calculated distance (air line) between San Antonio Aguas Calientes and Retalhuleu is approximately 60 miles respectively 97 kilometers.
By car or train, the actual journey to Retalhuleu is certainly longer, as only the direct route (as the crow flies) between San Antonio Aguas Calientes and Retalhuleu has been calculated here.
Air line (approximately)
97 kilometers
52 nautical miles