The calculated distance (air line) between Kőbánya and Salgótarján is approximately 52 miles respectively 84 kilometers.
By car or train, the actual journey to Salgótarján is certainly longer, as only the direct route (as the crow flies) between Kőbánya and Salgótarján has been calculated here.
Air line (approximately)
84 kilometers
46 nautical miles