There will be no Caribbean cruises until the end of January 2021, with all sailings into and out of Southampton cancelled until February.
This extends the period cancellations for P&O, which had previously put a big red X in every calendar day until November 12.
“With evolving restrictions on travel from the UK, unfortunately it is necessary to cancel these itineraries,” said P&O Cruises boss Paul Ludlow.
“These further cancellations vary according to ship as well as complexity and length of itineraries, advice and guidance regarding ports of call and current air availability for fly/cruises.
“We are continuing to monitor the overall situation closely and will certainly reintroduce cruises should the opportunity arise and it is feasible to do so.”
The company’s Arcadia and Aurora ships have already been cancelled through to the end of their spring world cruises.
Efforts to improve health and hygiene
With Carnival's name closely associated with the spread of coronavirus around the world, Ludlow said the company is working with some of the “most brilliant minds in science as well as government at the highest level” to develop improved health and hygiene regimes for when sailing resumes.
“Whilst adherence to the protocols on board and ongoing vigilance will be critical, this will always be coupled with providing the well-deserved and memorable holidays for which we are known, with all the standout moments on board and experiences on shore.”
Carnival, which earlier this year announced 1,100 job cuts because of the pandemic, this week revealed it had US$8.2bn of cash in the bank after recording a US$2.9bn loss for its third-quarter.
The group said its Italian brand, Costa, completed its first cruise for months last week September 6 and was expected to soon be joined on the high seas by Germany’s Aida.
The FTSE 250 group said cumulative advanced bookings for the second half of 2021 currently are at the higher end of its historical range, later also announcing it has sold off its Carnival Fascination and Carnival Imagination cruise ships.