Cruise & Maritime Voyages is extending the suspension of cruises from July 1 to August 25.
The company blamed the continued global Covid-19 pandemic, government advisories still in force and the lockdown of many countries and ports around the world.
Affected passengers are being offered an a future cruise credit of 125% of the amount paid, valid until March 31, 2021 for all sailings next year or 2022.
CMV has also extended a flexi-cancellation transfer policy for sailings departing up to September 30.
This allows booked passengers to transfer, without charge, seven days prior to the departure date to any 2020-21 or 2022 sailing and to receive a 125% future cruise credit.
For families due to travel on one of three multi-generation summer sailings, a 50% discount will be applied to the 2021 or 2022 teen and child fares for bookings that are transferred. A two for one early booking offer for 2021 departures has been extended until July 31.
Chief executive Christian Verhounig said: “Due to the continued global pandemic, we are still unable to perform our scheduled itineraries and to deliver the travel experience normally enjoyed by our valued passengers.
“We have therefore taken the decision to temporarily further suspend all cruises until 25th August 2020, when we very much hope to be able to resume service.
“We are extremely proud to see that 70% of our passengers affected by the cancellation of their cruise have either re-booked and transferred onto a future 2021 cruises or require more time with the peace of mind of a refund credit note.
“Many passengers are also waiting until the release of our 2022 cruise programme later this year. This is a great sign and we know that passengers are looking forward to travelling with us in the near future.”