The line said that following the US Centers for Disease Control’s decision to extend its no-sail order until 31 October, it now deemed November operations "unfeasible".
After the new order was issued, Carnival initially cancelled all cruise operations but those due to depart Port Miami and Port Canaveral.
It has also cancelled five cruises scheduled to operate from Sydney, departing variously from 16 January 2021 to 8 February 2021.