The calculated distance (air line) between San Marcos de León and Álvaro Obregón is approximately 146 miles respectively 235 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 Marcos de León and Álvaro Obregón has been calculated here.
Air line (approximately)
235 kilometers
127 nautical miles