The calculated distance (air line) between San Sebastián de los Reyes and Majadahonda is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Majadahonda is certainly longer, as only the direct route (as the crow flies) between San Sebastián de los Reyes and Majadahonda has been calculated here.
Air line (approximately)
23 kilometers
12 nautical miles