Havila Castor and Havila Capella had been due to commence operations early in 2021 but are now expected to be delivered to Norway from the Tersan Shipyard in Turkey at the end of May or early June.
It will then take several weeks to prepare the vessels to operate, the line said.
Chief executive Arild Myrvoll said he was “deeply disappointed” the ships were not able to sail sooner and apologised to guests and employees.
“In any other year, a delay of any length would prove very challenging. However, with the current travel restrictions to and within Norway, we do not anticipate strong demand until the summer, by which time we expect to be sailing,” Myrvoll added.