The nearest airport is KLU - Klagenfurt (Worthersee Intl), located 40.5 km west of Hart.
Other airports nearby include LJU - Ljubliana Ljubljana (55.3 km south west), GRZ - Graz (59.1 km north east), MBX - Maribor (65.1 km east), ZAG - Zagreb (135.7 km south east),