Chelsea Clinton and her husband Marc Mezvinsky flew first class to London on Thursday, just weeks ahead of their eighth wedding anniversary.

The couple's two young children were not with them on Thursday morning as they boarded the American Airlines flight at New York's John F Kennedy International Airport.

Clinton, 38, and Mezvinsky, 40, will be celebrating their eighth wedding anniversary is at the end of the month, on July 31.

Chelsea Clinton and her husband Marc Mezvinsky traveled from New York to London on Thursday, weeks ahead of their eighth wedding anniversary

The couple looked casual as they boarded the flight, with Clinton carrying an iced coffee and wearing jeans, white sneakers and a cardigan.

Mezvinsky, wearing a gray sweater, jeans and a red baseball cap, rolled a black suitcase as they walked through the tunnel from the terminal to the plane.

Their direct flight to London landed at Heathrow Airport just after 10pm on Thursday.

The couple were all smiles as they walked through the London Airport, with Clinton adding a yellow baseball cap to her ensemble. Mezvinsky's roller suitcase was no where to be seen.

They arrived at Claridge's hotel - in the Mayfair neighborhood of London, just a short walk away from Hyde Park- in a black Mercedes.

The five-star luxury hotel has hosted many celebrities through the years, including Audrey Hepburn, Cary Grant, Kate Moss, Victoria Beckham and Gwyneth Paltrow.

The hotel is a favorite of Hillary Clinton, who has stayed at Claridge's numerous times throughout the years.

The couple looked casual as they boarded the flight, with Clinton carrying an iced coffee and wearing jeans, white sneakers and a cardigan

Mezvinsky, wearing a gray sweater, jeans and a red baseball cap, rolled a black suitcase as they walked through the tunnel from the terminal to the plane. Their direct flight to London landed at Heathrow Airport just after 10pm on Thursday

It is unknown how long the couple will stay in London or who is watching their children while they are gone

They are staying at Claridge's hotel in the Mayfair neighborhood of London, just a short walk away from Hyde Park.

Rooms at the hotel cost anywhere from $795 (£600) to $4,600 (£3,480) a night.

Clinton and Mezvinsky, who quietly closed his hedge fund last year, were last seen in London in February, when they sat front row at Burberry's Fashion Week show.

The former first daughter has been vocal on Twitter recently, fighting against President Donald Trump's immigration policies and demanding reform.

'I don't understand anyone who isn't outraged that our government has taken kids from their families at the border,' Clinton said in a tweet on Thursday.

She has also spoken out about child hunger and suicide.

On Friday she tweeted out a link to a Washington Post column about the deaths of Kate Spade and Anthony Bourdain.

The couple were all smiles as they walked through the London Airport, with Clinton adding a yellow baseball cap to her ensemble. Mezvinsky's roller suitcase was no where to be seen

Chelsea walked steps ahead of her husband as he checked his phone at Heathrow Airport. The couple were last seen in London in February, when they sat front row at Burberry's Fashion Week show

Claridge's is a favorite of Hillary Clinton, who has stayed at Claridge's numerous times throughout the years. She stayed there during the above pictured trip in October 2017

'Suicide is a national epidemic,' she wrote. 'We need to treat it like one'.

It appears that Chelsea's UK visit will just miss her mother's, who recently spoke at Oxford University.

Hillary Clinton made an appearance at Oxford after receiving an honorary degree at Trinity College in Dublin in June.

In a speech at Oxford University on June 25, Hillary Clnton bemoaned the American electoral college system that saw her win the popular vote in the 2016 election but lose the presidency.

'Populists can stay in power by mobilizing a fervent base,' she said during her Oxford University's Romanes Lecture. 'Now, there are many other lessons like this, she said, adding that she had 'my personal experience with winning three million more votes but still losing.'

'And we will leave discussions of American Electoral College for another day,' Hillary added.