The calculated distance (air line) between Šentilj v Slov. Goricah and Ajdovščina is approximately 100 miles respectively 160 kilometers.
By car or train, the actual journey to Ajdovščina is certainly longer, as only the direct route (as the crow flies) between Šentilj v Slov. Goricah and Ajdovščina has been calculated here.
Air line (approximately)
160 kilometers
86 nautical miles