three ways to get upgraded cabin on a Carnival Cruise first loyalty program membership members of Carnival's loyalty program may receive promotional deals including invitations to bid on upgrades or discounted upgrades members may also earn points that can be used for perks like free or discounted upgrades second working with a travel agent travel agents who work closely with Carnival Cruise Line may be able to request upgrade on your behalf third book during the offseason Carnival Cruise Lines may be more likely to offer upgrades during the offseason when ships are less full