Prince Harry decided to fly to London uninvited at such short notice and caused consternation among the royal family.
Prince Harry took a transatlantic flight after King Charles' shock cancer diagnosis.
After the lightning trip, she only had a 30-minute meeting with King Charles' father, according to The Sun.
Family and friends of King Charles say his spirits are high as he battles cancer.
King Charles took a leave of absence from his general royal duties after being diagnosed with cancer, which was accidentally discovered during tests during treatment for an enlarged prostate.
He has now returned to Sandringham, Norfolk, where he will rest between outpatient treatments.
It was 16 months since Prince Harry saw each other in person during his overnight stay in the capital with Camilla.
Charles' displeasure with the unpredictable Harry
According to royal expert Robert Johnson, Prince Harry was not invited to travel 5,500 miles.
“I am told the reality is more complicated and more chaotic. That Prince Harry has caused concern by making the decision to fly at short notice.
The king was displeased with what was accomplished by his passionate and well-intentioned son.
Charles needs some peace and quiet at the moment, having planned to fly to the tranquility of Norfolk with his wife Camilla much earlier on Tuesday.
However, his plans were changed by Prince Harry, who is believed not to have spent the night at the royal estate, but instead stayed at a hotel.”
Last year, King Charles ordered Prince Harry and Meghan Markle out of their home at Frogmore Cottage in Windsor.
The Sussexes are said to need an official invitation to stay with members of the royal family at the protected estate.
It is believed that Prince Harry did not meet his brother Prince William during this unplanned trip.
The Prince of Wales, according to sources, has no plans to see his brother during his brief visit to England.
