The expenditure covers the policing costs in Cork city, Cork north and Kerry divisions and the cost of preparing for the visit.
The costs were revealed to the Evening Echo through the Freedom of Information Act and come just as Cork City Council have revealed that up to €200,000 was spent on the visit by the local authority.
The policing spend included around-the-clock security at Ballyvolane House in Castlelyons, where the couple stayed for two nights.
In the weeks before the visit, vetting was carried out of people regularly using local roads leading to the venue, as part of the policing operation.
It also included a security operation in the city centre while the couple visited City Hall for a civic reception, the Crawford Gallery for a VIP banquet, and the English Market to follow in the footsteps of Queen Elizabeth II in 2011.
A Garda spokesman said: “The visit of HRH the Prince of Wales and HRH the Duchess of Cornwall required security arrangements to be put in place by An Garda Siochána to ensure the safety of the visitors and the maintenance of public safety.”
He added: “The total expenditure by An Garda Siochána from January 1, 2018, to September 26, 2018, in respect of the visit was €1,311,670.
“This expenditure relates to salaries, wages, allowances, travel, subsistence, incidental expenses, communications and other equipment.”
The spokesman added that the figure could increase as “there may still be outstanding financial claims to be processed.”
The costs for Cork City Council included almost €6,000 for refreshments at the civic reception and close to €20,000 for the VIP banquet at the Crawford Gallery.