The nearest airport is KLU - Klagenfurt (Worthersee Intl), located 31.7 km west of Unternberg.
Other airports nearby include LJU - Ljubliana Ljubljana (54.1 km south west), GRZ - Graz (63.8 km north east), MBX - Maribor (74.7 km east), TRS - Ronchi De Legionari Ronchi Dei Legionari (135.7 km south west),