Carnival Cruise offers several ways to enhance your vacation through its upgrade policy, which allows guests to request a Carnival Cruise room upgrade before departure. While Carnival cabin upgrades aren’t guaranteed, you can increase your chances by booking early, joining the VIFP loyalty program, or selecting a guaranteed room. Look out for Carnival room upgrade offers, including last-minute deals, email bids, and automatic upgrades—just be sure to confirm any changes before boarding, as upgrades aren’t allowed once the cruise begins.