The calculated distance (air line) between Petatlán and Álvaro Obregón is approximately 185 miles respectively 297 kilometers.
By car or train, the actual journey to Álvaro Obregón is certainly longer, as only the direct route (as the crow flies) between Petatlán and Álvaro Obregón has been calculated here.
Air line (approximately)
297 kilometers
160 nautical miles