The calculated distance (air line) between Kostanjevica na Krki and Ajdovščina is approximately 73 miles respectively 117 kilometers.
By car or train, the actual journey to Ajdovščina is certainly longer, as only the direct route (as the crow flies) between Kostanjevica na Krki and Ajdovščina has been calculated here.
Air line (approximately)
117 kilometers
63 nautical miles