During World War II, the airport became again a military airport, as it was considered to be the most important in Transylvania. In 1940, as a result of the Second Vienna Award, Northern Transylvania (including Cluj) was ceded to Hungary and thus the airport was used by the Hungarian Air Force and German Luftwaffe. Malert airline also operated flights to Budapest during these years. In October 1944, the Hungarian forces in the city were defeated by the Romanian and Soviet armies. By the time of the reconquest of the airport by the Romanian No. 4 Fighting Squadron "Focşani", in late September 1944, the airport was completely destroyed.