The tour, which kicks off on Friday, July 6 in Detroit, will feature this year's Top 10 finalists DeAndre Brackensick, Hollie Cavanagh, Colton Dixon, Heejun Han, Skylar Laine, Joshua Ledet, Phillips, Jessica Sanchez, Elise Testone and Erika Van Pelt.
"It's going to be a lot of fun at the beginning, and then probably a few weeks into the tour - I give it about six weeks - people are probably are probably going to want to cut each other's throats and get mad at each other," Phillips told Billboard.
"I hope it doesn't get that way, but I have a feeling it might be, because we're gonna be tired from doing interviews and just wanting to sleep.
"Heejun is probably gonna be really messy; I might be a little messy, no lie, but I try not to be. It's gonna be a long summer."
Phillips is currently preparing for his debut album, planned for a November release.
Watch Phillip Phillips perform on American Idol below: