Harry's US return means he won't be on hand to celebrate his grandmother Queen Elizabeth II's 95th birthday on Wednesday, as he had considered doing.
Due to COVID-19 restrictions, the queen sat alone during the sombre service for Philip, whom she had previously described as her strength and stay during her long reign.
Her birthday falls within the two-week royal mourning period for Philip that is being observed until Friday.
Queen Elizabeth will bid a final farewell to Prince Philip, her husband of more than seven decades, at a ceremonial funeral on Saturday, with the nation set to fall silent to mark the passing of a...
The funeral of the Duke of Edinburgh will be held at Windsor, with no public access nor public procession beforehand, said a Buckingham Palace spokesperson.
Philip, who had been at the queen's side throughout her 69-year reign, died at Windsor Castle on Friday, aged 99. His funeral will be held on Saturday.
Born into an age of revolutions in the wake of a pandemic, Prince Philip lived through a tumultuous century and worked to make the British monarchy a rock of stability in changing times.
“You know it’s going to happen but you are never really ready,” Princess Anne said in a statement on Sunday.
“As you can imagine, my family and I miss my father enormously,” Charles, the couple’s eldest son and heir to the throne, said outside his Highgrove House home in west England.
The Royal Family's website featured a black-and-white portrait of the prince, also known as the Duke of Edinburgh.