The calculated distance (air line) between San Pedro Sacatepéquez and Retalhuleu is approximately 30 miles respectively 49 kilometers.
By car or train, the actual journey to Retalhuleu is certainly longer, as only the direct route (as the crow flies) between San Pedro Sacatepéquez and Retalhuleu has been calculated here.
Air line (approximately)
49 kilometers
26 nautical miles