The line will restart cruises on Monday afternoon (5 July) with new ship Borealis departing on its maiden voyage from Liverpool.
The 1,360-guest vessel – acquired by Fred Olsen last summer alongside sister ship Bolette - will initially operate at 50% capacity.
Deer thanked “each and every member of our wonderful crew, our shoreside team and our trade partners” for their “hard work, dedication, passion and commitment” during the line’s suspension of sailing.