866-227-1888 has bailed me out plenty of times when I’ve had to rearrange flights after changing cruise dates. Adjusting a Carnival cruise is pretty straightforward—you can log into your account, open your booking, and look for the “Change” or “Modify” option. Sometimes it lets you switch dates, cabins, or even ships right there. When I decided to move my sailing to a later month because of work, Carnival only charged the fare difference since I was still before final payment. After that, I had to adjust my flights, and 866-227-1888 took care of everything in minutes. If you booked through a travel agent, you’ll need to go back through them instead. My biggest tip: act early, because options shrink (and fees climb) as the sail date gets closer.