He was home in Los Angeles over the weekend where he had what looked like a tense reunion with estranged wife Jennifer Garner.

And Ben Affleck still looked in a solemn mood as he touched down at London's Heathrow airport on Monday.

The actor's arrival in London came a day after Jennifer was seen appearing to wipe away tears as they spent time with their children in LA over the weekend.

Tense: Ben Affleck looked in a solemn mood as he touched down at London's Heathrow airport on Monday after a trip home to Los Angeles

Ben dressed down for his flight, teaming a leather jacket with loose fit jeans and his favourite Boston Red Sox baseball cap.

Hiding behind shades at one point during his stroll to his car, the US actor failed to raise a smile.

Ben is back in London to continue filming for the upcoming movie Justice League, where he will be reprising his role as Bruce Wayne/Batman.

During a break from filming over the weekend, Ben was back home in LA, spending time with Jennifer, who filed for divorce from the actor in June 2015, and their three children.

Back to work: The actor's arrival in London came a day after Jennifer was seen appearing to wipe away tears as they spent time with their children in LA over the weekend

It seems Jennifer couldn't hold back her tears beside her estranged second husband in a tense reunion Sunday.

As the 44-year-old Golden Globe winner appeared to wipe away her sorrow, the 44-year-old Oscar winner wore a strange smile on his stubbly face.

But once inside their car, Affleck expressed anger at Garner as she kept her eyes down.

The Daredevil co-stars, wearing matching dark rinse jeans, were seen collecting their two youngest children -Seraphina, seven, and Samuel, four - from a martial arts class. They are also parents to 10-year-old Violet.

Filming: Ben is back in London to continue filming for the upcoming movie Justice League, where he will be reprising his role as Bruce Wayne/Batman

Garner and Affleck reportedly 'got along great' while vacationing last week at one of their 'favorite places' - Yellowstone Club in Big Sky Montana.

'They wanted to be together as a family,' an insider told Us Weekly. 'There was a cake and they did the usual stuff: hiking and playing outside.'

However, the source noted that the Suicide Squad actor and the Miracles from Heaven actress 'are not getting back together' and 'did not sleep in the same room.'