The calculated distance (air line) between Usera and San Sebastián de los Reyes is approximately 12 miles respectively 20 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 Usera and San Sebastián de los Reyes has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles