Starting the career in Hillerstorps GoIF and playing there until 1999 when he moved to IFK Värnamo, there he played for two seasons under former Swedish international star Jonas Thern and when Thern became new manager for Halmstads BK he brought Ingelsten with him, during his time in Halmstads BK he made several appearance but failed to gain the liking of the supporters, he won "Stora Silvret" (eng: The Big Silver) in 2004 when Halmstad missed the Allsvenska title in the final game, he also scored the goal that would send the 2005 UEFA Cup Final runners-up Sporting Lisbon out of the 2005–06 UEFA Cup. In 2007 Ingelsten was sold to Kalmar FF, yet again winning the "Stora Silvret" and also winning Svenska Cupen the same year. In 2008, he became the top goalscorer in Allsvenskan with 19 goals, helping Kalmar FF win the league. This also earned him a spot in the national team against Portugal after Markus Rosenberg got injured prior to the 2010 FIFA World Cup qualification on Råsunda but never came on as a substitute.