Prince Harry swiftly returned to Heathrow Airport following the coronation service at Westminster Abbey, according to reports.
The Duke of Sussex, 38, did not travel to Buckingham Palace with other members of the Royal family, or stand on the balcony for the flypast, as the coronation procession drew to a close.
Prince Harry’s car was instead spotted at Heathrow Airport just an hour after the coronation service wrapped up on Saturday afternoon, The Sun reports.
It is understood he was rushing back to his home in Montecito, California, to celebrate his son Archie’s fourth birthday with wife Meghan and their daughter Lillibet.
He had only arrived in London the day before, via a commercial American Airlines flight from Los Angeles to London, shocking other passengers, according to The Express.
The Duchess of Sussex did not travel with her husband to London to attend coronation celebrations, but stayed home in the US with the couple’s two children.
Archie’s birthday, also on May 6, is reportedly one of the reasons she chose not to attend the celebrations at Westminster Abbey.
Prince Harry watched his father be crowned next to Princess Eugenie’s husband Jack Brooksbank. Harry has previously spoken about his close relationship with his cousin Eugenie, the daughter of Prince Andrew, and her visits to the US to see Harry were included in Meghan and Harry’s Netflix documentary.
Harry was accompanied to the ceremony by Princess Beatrice’s husband Edo Mapelli Mozzi.
The Duke of Sussex arrived at the church along with Princess Anne, Prince Andrew and their children shortly before 10.40am - separately to his brother Prince William.
When the congregation paid homage to the King, Harry was seen along with the other royals around him, speaking the words: “God save King Charles. Long live King Charles. May the King live forever.”
Unlike Harry, the Prince of Wales had several duties to perform during the ceremony.
William approached the King to clothe him with the Stole Royal – a golden priestly scarf - shortly before he was crowned.
In a break with tradition, the Prince of Wales was the only blood prince to pay homage during the service.
Kneeling before the King, he said: “I, William, Prince of Wales, pledge my loyalty to you and faith and truth I will bear unto you, as your liege man of life and limb. So help me God.”