The calculated distance (air line) between Veľký Krtíš and Trnava is approximately 82 miles respectively 132 kilometers.
By car or train, the actual journey to Trnava is certainly longer, as only the direct route (as the crow flies) between Veľký Krtíš and Trnava has been calculated here.
Air line (approximately)
132 kilometers
71 nautical miles