The calculated distance (air line) between San Martín de las Pirámides and Álvaro Obregón is approximately 34 miles respectively 55 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 Martín de las Pirámides and Álvaro Obregón has been calculated here.
Air line (approximately)
55 kilometers
29 nautical miles