The calculated distance (air line) between Puente de Vallecas and Majadahonda is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Majadahonda is certainly longer, as only the direct route (as the crow flies) between Puente de Vallecas and Majadahonda has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles