The calculated distance (air line) between Sv. Ana v Slov. Goricah and Celje is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Celje is certainly longer, as only the direct route (as the crow flies) between Sv. Ana v Slov. Goricah and Celje has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles