Cunard has further extended cruise cancellations until June next year.
The Carnival Corporation brand blamed “current travel constraints in place across the world”.
Cruises by Queen Mary 2 until May 28 and Queen Elizabeth to June 4 have been cancelled.
Departures by Queen Victoria remain unaffected and are scheduled to resume on May 17.
Affected passengers will receive a 125% future cruise credit available to use towards sailings until early 2023 or a refund.
Cunard president Simon Palethorpe said: “Our extension to the pause in operations is the result of the ongoing restrictions on cruising in the UK and around the world and recognises the significant lead times to return to service, once those restrictions are lifted.
“We are extremely sorry to be extending our pause in operations and for any disappointment this will cause. We know how much careful consideration goes into planning a holiday and apologise that our guests now have to wait a little bit longer to travel once again with Cunard.
“Guests are able to use their enhanced 125% future cruise credit to book for later in 2021 or for one of our newly announced 2022 voyages.
“The tremendous response already to our 2022 voyages, put on sale just a few weeks ago, clearly demonstrates our guests are eagerly anticipating travelling again with us. We’re equally looking forward to the time when we can welcome back our guests.”
He added: “We would like to thank our travel agent partners for their ongoing support in the midst of continued challenging circumstances.
“Their support and commitment to looking after guests has been unwavering throughout and when there have been opportunities to promote new sailings agents have seized them and the response has been terrific.”