Early career Vonlanthen played as a junior for
BSC Young Boys in Switzerland. In the
2001–02 season, he made his debut as a 16-year-old in the
Swiss Super League starting eight games and appearing once as a substitute. In the summer of 2003, he was transferred to the Dutch
Eredivisie club
PSV Eindhoven. On 21 June 2004, Vonlanthen became the youngest goalscorer when he scored for the
Switzerland national team against
France in
Coimbra, Portugal at the age of 18 years and 141 days old. He made a good initial impression and helped PSV qualify for the
UEFA Champions League. After a good first season, he began to lose form and as a consequence was loaned out to Italian side
Brescia Calcio for the last six months of the 2004–05 season. He was again loaned out to
NAC Breda for the 2005–06 season.
Red Bull Salzburg At the start of the 2006–07 season, Vonlanthen transferred to
Red Bull Salzburg in the
Austrian Bundesliga. On 13 July 2009,
FC Zürich signed the Swiss forward on a season long loan deal. The move was not made permanent, and Vonlanthen returned to Salzburg for the start of the 2010–11 season.
Itagüí, Wohlen and initial retirement Vonlanthen moved to
Colombian Primera División side
Itagüí in August 2011. On 30 May 2012, Vonlanthen announced his retirement at age 26. According to him, he 'could not face the prospect of undergoing a knee operation'.
Return On 13 June 2013, Vonlanthen came out of retirement to join
Grasshoppers, signing a one-year deal with an option for a further two years. On 27 December 2013, Vonlanthen was loaned out to Swiss second division side
Schaffhausen, due to a lack of playing time at Grasshoppers. He retired in August 2018 after two years with
FC Wil. ==International career==