You will get a full refund if you notify Royal Caribbean at least 75 days prior to your sailing date (60 days for 3 and 4-night cruises or 90 days for holiday sailings). 【+44-203-900-3980 (UK) or 1-877-350-4939 (USA) 】.
https://www.devex.com/people/uideline-faqs-how-do-i-cancel-a-cruise-without-penalty-2441214
