The calculated distance (air line) between Šentilj v Slov. Goricah and Izola is approximately 124 miles respectively 199 kilometers.
By car or train, the actual journey to Izola is certainly longer, as only the direct route (as the crow flies) between Šentilj v Slov. Goricah and Izola has been calculated here.
Air line (approximately)
199 kilometers
107 nautical miles