To do online check-in for Carnival, visit carnival website or call 1-833-807-7245 the Carnival cruise help center tollfree , log in to your account (or create one), and provide guest info, passport/ID details, emergency contacts, and travel plans, setting your port arrival time within 14 days before sailing to get boarding passes and luggage tags, according to sources like the Carnival Cruise Line website and YouTube tutorials.
