cancel your P&O Cruises booking, contact their customer service or your travel agent. You can also call +1-888-653-0010 (OTA) for assistance.

According to the P&O Cruises Cancellation Policy, cancellation fees vary based on how far in advance you cancel. The closer to the departure date, the higher the fee.

Under the P&O Cruises Refund Policy, refunds are processed based on the fare type and cancellation timing. Non-refundable deposits and certain promotional fares may not be eligible for a full refund.

For the best outcome, cancel as early as possible and review your booking terms.
https://www.cruisesfares.com/blogs/p-o-cruises-cancellation-policy