The nearest airport is GRZ - Graz, located 47.4 km south west of Flattendorf.
Other airports nearby include MBX - Maribor (89.2 km south), VIE - Vienna Schwechat (105.8 km north east), KLU - Klagenfurt (Worthersee Intl) (138.8 km south west), BTS - Bratislava M R Stefanik (139.8 km north east),