What happens if the cruise fare of my new reservation is different from the amount of my Future Cruise Credit?
COVID-19 Future Cruise Credit – Frequently Asked Questions
Standard prevailing rates apply and you are responsible for any balance due after the Future Cruise Credit has been applied.
If the value of your Future Cruise Credit exceeds the cost of your new reservation, the difference will automatically be converted into a nonrefundable Onboard Credit. (See Onboard Credit details.) You can also apply your unused Future Cruise Credit to an additional sailing prior to your first cruise commencing.