Sources close to the couple, who will be joined with their own team of Scotland Yard bodyguards, however said they will be subject to extra precautions.
'There is no suggestion of a direct threat to the Duke and Duchess whatsoever but the way these demonstrations are spreading is being taken into account when planning their movement,' said one.
William and Kate are due to arrive in New York on Sunday afternoon where they will be staying - like William's late mother before him - at the Carlyle Hotel, where a suite costs £9,000.
The couple will undertake a whirlwind trip, packing seven public engagements in two days.
On their first night, the Duke and Duchess attend a private dinner held on behalf of American Friends of the Royal Foundation in New York.
The foundation was set up by Princes William and Harry in 2009 and was heavily involved in the organisation of the Invictus Games.
During his visit, the Prince will be hosted by President Barack Obama in Washington DC while Kate remains in New York.
Tonight a White House spokesman said it welcomed the Prince's devotion to the issue, describing it as 'both a national security threat and a devastating environmental problem.'
His visit comes almost thirty years after Prince Charles and Diana were hosted by then President Ronald Regan and his wife, Nancy, in 1985.
In New York, Duchess will carry out two solo engagements accompanied by city's First Lady, Chirlane McCray.
The two women will visit a local child development centre and a lunch, hosted by the British Consul General, to celebrate the achievements of a successful British community in New York from the culture, arts, hospitality and business sectors.
As Patron of the University of St Andrews 600th Anniversary Campaign, the prince, accompanied by his wife, who met while students at the college, will also attend a Gala Dinner attended by stars including actor Tom Hanks.
Time has also been set aside for a visit to the National September 11 Memorial and Museum and even an NBA Basketball game, where many are hoping they will be introduced to fans Beyonce and Jay Z.
A Kensington Palace spokesman said neither royal had been to New York before and were hugely looking forward to the visit.
'The couple really are very much looking forward to all the special moments of the visit.
'They've been an integral part in planning it,' a spokesman said.
- Daily Mail