The calculated distance (air line) between San Salvador El Seco and Álvaro Obregón is approximately 103 miles respectively 166 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 Salvador El Seco and Álvaro Obregón has been calculated here.
Air line (approximately)
166 kilometers
89 nautical miles