The nearest airport is ACH - St Gallen Altenrhein, located 30.0 km west of Unterdorf.
Other airports nearby include FDH - Friedrichshafen (38.3 km north west), ZRH - Zurich (106.3 km west), INN - Innsbruck (108.1 km east), SMV - Samedan (108.1 km south),