Camilla will be making her first trip to Papua New Guinea, Australia and New Zealand, in a private or public capacity, when the royal couple's Jubilee tour begins on Saturday.
Charles, a seasoned traveller, has visited the southern hemisphere nations many times.
He represented the Queen at Papua New Guinea's independence ceremony on September 16, 1975.
In a message to the country's Prime Minister Peter O'Neill and the Governor General, Sir Michael Ogio, sent last month, he said:
"We are both greatly looking forward to experiencing the wonderful, culture and hospitality of Papua New Guinea, which I remember so well from my previous visits all those years ago."