The calculated distance (air line) between Diadema and Ferraz de Vasconcelos is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Ferraz de Vasconcelos is certainly longer, as only the direct route (as the crow flies) between Diadema and Ferraz de Vasconcelos has been calculated here.
Air line (approximately)
31 kilometers
16 nautical miles