The calculated distance (air line) between San Diego de la Unión and Álvaro Obregón is approximately 181 miles respectively 292 kilometers.
By car or train, the actual journey to Álvaro Obregón is certainly longer, as only the direct route (as the crow flies) between San Diego de la Unión and Álvaro Obregón has been calculated here.
Air line (approximately)
292 kilometers
158 nautical miles