The nearest airport is ZAG - Zagreb, located 48.2 km east of Hartje.
Other airports nearby include MBX - Maribor (83.2 km north), RJK - Rijeka (90.8 km south west), LJU - Ljubliana Ljubljana (93.2 km north west), KLU - Klagenfurt (Worthersee Intl) (131.2 km north west),