The calculated distance (air line) between Puente de Vallecas and Collado-Villalba is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Collado-Villalba is certainly longer, as only the direct route (as the crow flies) between Puente de Vallecas and Collado-Villalba has been calculated here.
Air line (approximately)
40 kilometers
21 nautical miles