However, these costs could also be diminished if the ship does not operate at its full boarding capacity.
For the G7 Summit, only 1,000 people stayed on MS Silja Europa due to Covid restrictions.
Concerns about the Covid risk have been raised concerning the vessels because the virus spreads rapidly in enclosed spaces without sufficient ventilation.
COP26 said last week that the Scottish Government and NHS Greater Glasgow and Clyde were consulted about the cruise ships plan and a rigorous Covid testing system will be in place.
If there is a similar restriction on the number of people staying on the ships - the costs would likely be as little as £300,000 a day for both ships, or as much as £1m a day.
Over the course of the entire summit, these vessels would likely cost £3.3m or as much as £12m in total.
Express.co.uk has contacted the organisers of the climate change conference for more information.
Source : https://www.express.co.uk/news/uk/1511216/COP26-accommodation-cruise-ships-taxpayers-EVG177