In 2013, Brittain starred in the drama film A Teacher directed by Hannah Fidell, with Lindsay Burdge, where he played the lead role of Eric Tull.

Also the same year, Brttain played the role of Jason in the crime-drama film Savage Youth opposite Grace Victoria Cox, Tequan Richmond and Chloë Levine.

[15][16] In 2019, Brittain co-starred Otmara Marrero, Sydney Sweeney and Sonya Walger in the romantic drama film Clementine as Beau.

[20][21] In 2021, Brittain appeared as Kirk in the dystopian action crime horror film by Everardo Valerio titled The Forever Purge.

[22] In 2022, Brittain co-starred alongside Ben Winchell and Aimee Teegarden in the drama film The Road to Galena, which was released in theaters and on demand on July 8, 2022.