Prince Harry heads straight to airport after coronation ceremony

While his father King Charles III waved to the masses from the balcony of Buckingham Palace, it's believed Prince Harry was already on his way to the airport to fly home to the US.

Just an hour after the coronation ceremony at Westminster Abbey, Harry was spotted at Heathrow Airport, according to The Sun, after he was seen getting in his car and leaving Westminster Abbey shortly after the ceremony.

It had previously been reported the Duke of Sussex wouldn't remain in the UK for long, and it was expected he would leave 'within 24 hours' to make it home for his son Archie's fourth birthday.

READ MORE: Harry unites with family as he arrives at Westminster Abbey

Leaving London's Westminster Abbey around 1.15pm, Harry was seen getting into a blacked-out electric BMW for the 32 kilometre journey to Heathrow, arriving by police convoy around 2.05pm.

Meanwhile, his father and Queen Camilla stepped out onto the balcony of Buckingham Palace, surrounded by other senior, working members of the royal family, as well as their grandchildren.

Prince William and Kate were also out to wave to crowds despite the wet weather n London, as well as their three children, Prince George, Princess Charlotte, and Prince Louis.

IN PHOTOS: The royal grandchildren delight at King Charles' coronation

Princess Anne also took to the balcony to celebrate the start of her brother's reign, as did Prince Edward, Sophie, Duchess of Edinburgh and their two children, Lady Louise Windsor and James Viscount Severn.

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Despite speculation that Prince Harry would appear on the balcony alongside his family, that was quickly quashed when he left Westminster separately from the other royals.

The Daily Mail reports he told Jack Brooksbank he would be 'heading off' during a conversation they shared inside Westminster Abbey, before saying the word 'airport', according to a professional lip reader.

Harry arrived alone to Westminster but was accompanied into the ceremony by Princess Beatrice's hubby Edo Mapelli Mozzi.

He then took a seat in the third row next to Princess Eugenie's husband Jack Brooksbank. On his other side was Princess Alexandra, 86, Queen Elizabeth's cousin.

While it was reported the duke had been invited to a post-coronation lunch at Buckingham Palace, in what many would have seen as an olive branch after his explosive memoir Spare, it seems he has declined the invitation.