It will sail a series of 10 and 11-day itineraries to the Canary Islands and the Mediterranean from Lisbon during the winter and spring next year. Voyages will be available for booking from 5 October.
The vessel, which was set to return on 17 April, 2022, will become the third ship in Seabourn’s fleet to return to service.
It will also sail a 15-day voyage along the coasts of the Mediterranean Sea from Lisbon to Athens where it will be positioned for its originally scheduled Eastern Mediterranean deployment in the summer.
Seabourn president Josh Leibowitz said the Canary Islands are "a tropical paradise for sun-seekers and nature enthusiasts".
"We saw the opportunity to bring Seabourn Encore back earlier than anticipated in these destinations rich in culture, history, and renowned cuisine, and with our partnership with UNESCO, to help guests discover something special all along the way," he added.