Can I Cancel a Carnival Cruise Without Penalty? Whether you're rethinking your plans or facing an emergency, knowing the Carnival Cruise cancellation policy is important. You can cancel a Carnival Cruise online through your booking account, or contact customer service for help. Penalty-free cancellations depend on how far in advance you cancel—typically, the earlier, the better. For d... https://www.cruisesfares.com/blogs/carnival-cruises-cancellation-policy