The calculated distance (air line) between Veľký Krtíš and Žilina is approximately 75 miles respectively 121 kilometers.
By car or train, the actual journey to Žilina is certainly longer, as only the direct route (as the crow flies) between Veľký Krtíš and Žilina has been calculated here.
Air line (approximately)
121 kilometers
65 nautical miles