The calculated distance (air line) between Tolmin and Šentilj v Slov. Goricah is approximately 97 miles respectively 157 kilometers.
By car or train, the actual journey to Šentilj v Slov. Goricah is certainly longer, as only the direct route (as the crow flies) between Tolmin and Šentilj v Slov. Goricah has been calculated here.
Air line (approximately)
157 kilometers
85 nautical miles