The 45-year-old star was snapped outside a treatment centre here, reported Us Weekly.
A source told the magazine, "Ben's main priorities have never wavered. He's focused on his family and spending time with (producer girlfriend) Lindsay (Shookus).
"Dealing with this disease is something he'll have to work on for the rest of his life and he remains focused on it."
Affleck first checked into rehab in 2001, shortly before his 29th birthday.
In March, the "Justice League" actor revealed he completed his term at a rehabilitation centre.
"I have completed treatment for alcohol addiction; something I've dealt with in the past and will continue to confront. I want to live life to the fullest..." wrote Affleck in a Facebook post.