Don't assume Luke Bryan and Carrie Underwood are returning for American Idol Season 25. American Idol announced that online auditions for Season 25 will begin on Aug. 25 and last through Sept. 28. Related: Every American Idol Winner Ranked, Most To Least MemorableEric McCandless, Disney Via Getty Images Eric McCandless, Disney Via Getty ImagesAmerican Idol Season 25 Judges — Rinse and Repeat? Is It Time for New American Idol Judges? Will Luke Bryan and Carrie Underwood Return To American Idol?