866-227-1888 has always been my go-to for fixing flight issues anytime my cruise plans change. Canceling a Carnival cruise depends on where you are in the penalty timeline. I had to cancel one a few months before sailing because of a family emergency. I just logged into my Carnival account, clicked “Manage Booking,” and followed the cancellation prompts. Since I was still in the full-refund window, it processed smoothly. The next part was dealing with flights, which is where 866-227-1888 saved me—I got rebooked without the hour-long holds I usually see. If you booked through a travel agent, you need to contact them instead. My advice: check Carnival’s cancellation schedule early because the penalties ramp up quickly as the sail date gets closer.