The calculated distance (air line) between Šempeter pri Gorici and Ajdovščina is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Ajdovščina is certainly longer, as only the direct route (as the crow flies) between Šempeter pri Gorici and Ajdovščina has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles