In the same interview, Harry revealed that Charles shared the health update with both his sons personally, whereafter Harry flew straight to London.
"I love my family, the fact I could jump on a plane and see him and spend any time with him - I'm grateful for that," he said.
A day after Buckingham Palace made Charles' cancer diagnosis public on February 5th, Prince Harry arrived at his father's royal residence Clarence House where they spent 30 minutes together.
Charles and Camilla then departed to nearby Buckingham Palace where they then helicoptered to Sandringham Estate in Norfolk.
Charles reportedly delayed his helicopter leaving by an hour so he could see his son face to face for the first time in more than 16 months, their last meeting taking place when Queen Elizabeth II died in September 2022.
Whilst aides have not yet confirmed how the Duke of Sussex reacted to hearing the news of his father's ailing health, his last minute decision to fly home does suggest that the bond between the father-son duo whilst at times strained, remains strong.
Given the Duke's former UK residence, Frogmore Cottage is now the home of Princess Eugenie, her husband Jack Brooksbank, and their two sons August and Ernest, it is expected that he stayed overnight at a luxury London hotel before jetting back to his home in Montecito, California.
When he last visited the country in September 2023 for the WellChild Awards, the royal was made to stay in a hotel after his request to stay at Windsor Castle was denied by the royal family due to the "last minute nature" of the request according to royal sources.
During that same trip, Harry was also unable to visit his father who was holidaying at Balmoral Castle due to scheduling conflicts.
Given when he and his wife Meghan were stripped of their right to utilise automatic police security when in the UK when they stepped down as working royals in 2020, the Duke travels with a private security entourage when visiting the UK.
It is currently unclear what the state of the relationship is between the King and his youngest son, Harry.
After a fleeting appearance in London for King Charles' historic coronation on May 6th, 2023 the pair have reportedly barely spoken, save for a handful of telephone conversations.
Buckingham Palace did not publically celebrate Prince Harry's 39th birthday on September 15, 2023, but the Duke did allegedly reach out to his father to wish him a happy 75th birthday in November that same year.
It is understood that the King received a video of his grandchildren singing Happy Birthday to their grandfather and that Meghan also spoke with her father-in-law.