The nearest airport is LJU - Ljubliana Ljubljana, located 22.6 km west of Kostanj.
Other airports nearby include KLU - Klagenfurt (Worthersee Intl) (55.4 km north west), MBX - Maribor (77.1 km east), GRZ - Graz (99.4 km north east), TRS - Ronchi De Legionari Ronchi Dei Legionari (108.7 km south west),