In 1905, Georg Count of Khevenhüller from Hochosterwitz Castle and in 1907 Dipl.-Ing. Joseph Sablatnig (Joseph Sablatnig was owner of the Fokker-Sablatnig, Deutsche Flugzeuge, Deutsche Motoren, Flugzeug Gesellschaft mbH, Berlin) were the first men in the sky over Carinthia and Klagenfurt.

In World War I and II, the airport of Klagenfurt was operated as a military airfield, and indeed Klagenfurt Airport was founded in 1914 as a military airport. The civil opening of Klagenfurt Airport on 17 May 1925, was an event for the City of Klagenfurt as well as for Carinthia.

In June 1929, the pilot hero of World War I, Julius Fedrigoni Edler von Etschthal, had the function of flight director of the airport until 1939. After the end of World War II, Julius Fedrigoni was returned to Annabichl, he worked with low-budget flight operations. On 1 January 1952, Korv. Kpt. Julius Fedrigoni founded the Committee city of Klagenfurt and he was flight director until 1956. Already in the years 1926 to 1938, seven airlines operated from Klagenfurt Airport. Countries like Germany, Italy, Yugoslavia and of course domestic flights to all major cities in Austria were connected with Klagenfurt. After 1950, the airport was connected with countries like Brazil, Israel, Venezuela, the Netherlands, Germany, the United Kingdom and others.

In spring 2014 the airport's home carrier Austrian Airlines announced the closure of their ticketing and service counters at Klagenfurt Airport due to decreasing demand, additional services will be instead provided directly at the check-in counters.

In April 2015, Austrian Airlines also announced that a closure of their domestic route to Vienna is under consideration within the next few years based on economic reasons. In the same year, the state government announced plans to partly sell its stakes in the airport to private investors.

As the airport suffered from a major decrease of passenger numbers in recent years it has been suggested by the management to establish major logistics and cargo operators here, which might be supported by the freight shipment operations handled at the relatively closely located harbours of the Adriatic Sea. The airport already features road and rail connections. However, Austrian Airlines stated later that the airport is not sufficient for cargo operations due to noise complaints and the night curfew.

In October 2015, the Austrian military announced it would end all operations and close its helicopter base at Klagenfurt Airport by the end of 2015. In August 2020, Ryanair announced plans to leave the airport and terminate their route to Palma de Mallorca Airport, which had been operated as a wet lease by Lauda.

IMPORTANT! For correct navigation at the Klagenfurt airport please find Content.xml file in path: C:\Users\username\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\ Move line with LOWK Klagenfurt scenery by JustSim above than flight simulator`s base navigation (fs-base-nav) inside Content.xml file. After saving restart simulator.