The nearest airport is KLU - Klagenfurt (Worthersee Intl), located 40.1 km west of Kollnitz.
Other airports nearby include GRZ - Graz (54.3 km north east), LJU - Ljubliana Ljubljana (62.5 km south west), MBX - Maribor (69.3 km east), ZAG - Zagreb (143.4 km south east),