He won seven medals at the FIS Nordic World Ski Championships with six golds (Individual normal hill: 2009, Team normal hill: 2001, 2005; Team large hill: 2005, 2007, 2009) and one bronze (Team large hill: 2001). He earned a bronze medal in the team event at the FIS Ski-Flying World Championships 2004 and finished 15th at the individual competition at those same championships. Loitzl has seven individual career victories from 1998 to 2003.
On 21 February 2009 Loitzl won the individual gold on the normal hill at the World Championships at Liberec ahead of fellow Austrian Gregor Schlierenzauer and Switzerland's Simon Ammann. Further success followed on 28 February the same year when Loitzl won gold as part of the Austrian quartet in the team large hill event.
His son Benjamin was born on 12 January 2005, his second child Nikolas was born on 10 February 2007. He has been married to Marika since 11 June 2006.