Spirit of Discovery will restart sailing in April, while the inaugural cruise of the line’s next new-build vessel, Spirit of Adventure, will take place in May.
A spokesperson said: "With Covid-19 bringing increasing restrictions to day-to-day life and most countries still not accepting cruise ships, we have taken the decision to further extend the suspension of our cruise operations."
Saga said cruise bookings for 2021 and 2022 "remain strong" showing evidence of "pent up demand for our boutique cruise offer".
