The calculated distance (air line) between Meco and San Sebastián de los Reyes is approximately 16 miles respectively 25 kilometers.
By car or train, the actual journey to San Sebastián de los Reyes is certainly longer, as only the direct route (as the crow flies) between Meco and San Sebastián de los Reyes has been calculated here.
Air line (approximately)
25 kilometers
14 nautical miles