The nearest airport is DTM - Dortmund, located 26.0 km north east of Knapp.
Other airports nearby include ESS - Essen Mulheim (32.0 km west), ZCA - Arnsberg Menden (39.6 km north east), DUS - Duesseldorf Dusseldorf (43.3 km west), CGN - Cologne Koln Bonn (54.7 km south),