All house spirits, wine, beer and soft drinks will be included in the overall price of a cruise aboard Discovery.
Sister ship Spirit of Adventure, joining the Saga fleet in August 2020, will also be all-inclusive.
Saga said the decision came following feedback from customers. Its cruises already include various complimentary services such as free WiFi.
Nigel Blanks, Saga chief operating officer, said the decision would “reaffirm Saga’s position as a niche luxury cruise operator”.
“Spirit of Discovery and Spirit of Adventure are the only boutique small ships being built with British market in mind,” he said.