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Ludwig memulakan kerjayanya pada usia sembilan ketika ia dipaparkan dalam mainan Harry Potter perdagangan, pekerjaan yang membolehkan dia untuk menandatangani dengan ejen dan mendapatkan kerja yang lebih komersial. Later he was cast in movies such as Air Bud: World Pup (2000), MXP: Most Extreme Primate (2003), Scary Godmother: The Revenge of Jimmy (2005), Eve and the Fire Horse (2005), The Sandlot: Heading Home (also known as The Sandlot 3) (2007). In addition to cinema, Ludwig has also worked in television. He has performed in movies made for television, such as A Little Thing Called Murder (2006), and television series such as The Dead Zone. Ludwig obtained his leading role in The Seeker: The Dark Is Rising (2007) after a "gruelling audition process." By his count, he had 16 auditions before finally being cast.

Ludwig's next lead role came in the part of Seth – one half of a teenage, alien brother-sister duo – in the film production of Race to Witch Mountain (2009), also starring Dwayne Johnson, the wrestler-turned-actor. Seth is the part originated by Ike Eisenmann in the 1975 original, Escape to Witch Mountain. The film opened at number one at the box office the weekend that it premiered, with receipts estimated at $25 million. Despite his early casting success with The Seeker, Ludwig indicated in an interview that it was his intention to attend university. In another interview, the actor said that the most challenging thing about filming The Seeker was trying "to juggle school while filming." He stated: "My school wasn't used to it, and I wasn't used to it. It was the most amazing experience, but it was really hard."

In the movie adaptation of The Hunger Games, Ludwig played Cato, the fierce male tribute from District 2, the primary threat to the protagonists' lives during the 74th Hunger Games. The film was released worldwide on March 23, 2012. Ludwig won the award for Best Fight on 2012 MTV Movie Awards along with Jennifer Lawrence and Josh Hutcherson, as well as the award for Best Villain at the 2012 Teen Choice Awards. Ludwig released his first single "Liv It Up (Teenage Wasteland)" on March 1, 2012. In 2013, he co-starred in the films Lone Survivor and Grown Ups 2. In 2014, he is currently a part of the main cast of the TV series Vikings, playing the character of Björn Ironside, the son of Ragnar Lothbrok and Lagertha. He also appeared in The Band Perry's music video for "Gentle on My Mind" alongside Teen Wolf actress Shelley Hennig.