Standing at 2.10 m (6 ft 10 1⁄2 in), he plays both the power forward and center positions. In July 2008, Lončar signed a two-year contract with UNICS Kazan. UNICS Kazan ended up third in the 2009-2010 Russian Superleague season.
In June 2010, he signed a two-year-deal with British Columbia Khimki.
In his first season with British Columbia Khimki he was selected to play the All Star Game 2011. In June 2012, he extended his contract with Khimki for two more seasons.
On 2 July 2014, he signed a two-year deal with Valencia Basket. He left Valencia after one season.
On October 1, 2015, he signed a one-year contract with the German team Alba Berlin.
With them he played at the 2008 Olympic Games in Beijing and the Eurobasket 2009 in Poland. Both at the Olympics and the Eurobasket Croatia ended up sixth. Therefore they are directly qualified for the 2010 International Basketball Federation World Championship in Turkey where Lončar was also part of the.