An original guest must remain on the booking, otherwise, this is considered a full stateroom cancellation and applicable cancellation penalties will be assessed to the original guests; new guests will be subject to prevailing cruise and air rates.

Yes, you can cancel a single guest from a Carnival cruise reservation, but the financial implications depend heavily on the timing and the original booking type. If you cancel a guest outside of the final payment period, you may only lose the deposit for that individual, though this varies by the specific promotion used (some "Early Saver" deposits are non-refundable). However, a major "catch" in the cruise industry is the Single Supplement fee. Most cruise cabins are priced based on "double occupancy." If removing one guest results in a single person occupying a cabin designed for two, Carnival will typically charge that remaining passenger a supplement fee, which can be up to 100% of the second person's fare. Essentially, the price of the cabin may not decrease even if one person stays home. If the cancellation happens within the "penalty period" (usually starting 75 to 90 days before sailing), the refund for the canceled guest will follow a sliding scale, often resulting in a total loss of the fare if canceled very close to the sail date. Taxes, fees, and port expenses for the canceled guest are usually refunded to the original form of payment regardless of when the cancellation occurs.