The nearest airport is ZQL - Donaueschingen Villingen, located 4.1 km south east of Klengen.
Other airports nearby include ZRH - Zurich (59.7 km south), CMR - Colmar Houssen (84.7 km west), MLH - Bale Mulhouse (84.8 km south west), FDH - Friedrichshafen (85.2 km south east),