In 2008, he took on the lead role as Zach Conroy in The Cutting Edge: Chasing the Dream, with Francia Raisa.
In February 2008, he was announced to portray the lead role of Will, in Lionsgate's Parody/Comedy film Disaster Movie.
From 2016 to 2018, he starred as Wyatt Logan, a time traveler, in the NBC series Timeless.In 2004, Lanter was a contestant on Bravo's reality show Manhunt: The Search for America's Most Gorgeous Male Model. Within a few weeks of moving to Los Angeles, California, Lanter successfully auditioned for the role of Nick on the supernatural teen-drama Fox series Point Pleasant.The series' fourth season premiered in September, 2011.Season five premiered on Cartoon Network on September 29, 2012.He stars with Kim Kardashian, Vanessa Minnillo and Carmen Electra.
The film, which was released on August 29, 2008, was a critical failure.
Its second season was broadcast in early 2018, but the series was not renewed by NBC.
On February 11, 2019, it was announced that Lanter was cast as George Hutchence in the upcoming Netflix superhero series, Jupiter's Legacy.
In April 2005, he signed on to become a series regular portraying the role of Horace Calloway on ABC's political drama series Commander in Chief, starring Geena Davis and Donald Sutherland.
The series premiered on September 27, 2005, ran for one season and was cancelled on June 14, 2006.
He had a major recurring role throughout the first and only season of the series.