The calculated distance (air line) between Brežice and Šentilj v Slov. Goricah is approximately 54 miles respectively 87 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 Brežice and Šentilj v Slov. Goricah has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles