How do I cancel my Royal Caribbean cruise without penalty? How to Cancel a Royal Caribbean Cruise Without Penalties Step-by-Step Guide to Canceling Your Royal Caribbean Cruise To receive a full refund (1-888-738-0812) for a Royal Caribbean cruise, you must cancel at least 75 days before the sailing date for 1–4 night cruises (1-888-738-0812). For cruises that are 5 nights or longer(1-888-738-0812), you must cancel at least 90 days before the sailing.