The calculated distance (air line) between Veľký Krtíš and Šaľa is approximately 68 miles respectively 109 kilometers.
By car or train, the actual journey to Šaľa is certainly longer, as only the direct route (as the crow flies) between Veľký Krtíš and Šaľa has been calculated here.
Air line (approximately)
109 kilometers
59 nautical miles