It would be the UK’s first official visit to the Mediterranean country since 1988, Hello! magazine reports. Then, the late Queen Elizabeth was welcomed by the former King Juan Carlos and Queen Sofia. She was joined by her husband, Prince Philip. Charles and Camilla are likely to be welcomed by the Spanish king, Felipe VI and Queen Letizia.
It is not known if they will meet the Spanish heiress, Princess Leonor, 20, or her sister, Infanta Sofia.
So far this year, the King has hosted Nigeria in the UK – back in March – and has made one state visit to the US in April.
The state visit across the pond was hailed as a success by both sides, with a senior Palace aide revealing at the time that the King “grasped in both hands” the “risk and challenge” of the US state visit but would not dwell on the perceived success of his trip.
The “high-stakes” address to Congress was one of several hurdles Charles overcame during his sternest diplomatic test to date, but it was also seen as an opportunity to deliver on palace objectives in support of the Government that requested the trip.
The last time Charles saw the Spanish royals was in 2023, when Felipe and Letizia came to the UK to attend His Majesty’s coronation.
They also attended a reception at Buckingham Palace for overseas guests.