The calculated distance (air line) between Šentilj v Slov. Goricah and Nova Gorica is approximately 108 miles respectively 173 kilometers.
By car or train, the actual journey to Nova Gorica is certainly longer, as only the direct route (as the crow flies) between Šentilj v Slov. Goricah and Nova Gorica has been calculated here.
Air line (approximately)
173 kilometers
94 nautical miles