They were seen boarding a private plane Friday, with a source telling PEOPLE that the family arrived at a ski resort in Montana, where they own a condo and they all spent Christmas together last year.
Affleck and Garner arrived at Van Nuys Airport outside Los Angeles with daughter Seraphina, 7, and son Samuel, 3. Their eldest daughter, Violet, 10, did not appear to be with the group.
The exes, who splint June after ten years together, are still living on the same property, with Affleck staying in the guesthouse.
Garner, who was just named as a presenter for the Oscars, and Affleck are working hard to make their pending divorce as smooth as possible for their three kids, a source told PEOPLE.
"[Garner] wants to get along with Ben for the kids' sakes," a source close to the couple said.
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That included spending the Christmas holidays, where they enjoyed a winter getaway at a ski resort in Big Sky, Montana.
"They had a nice Christmas," a source told PEOPLE.
"Jen and Ben seem happy to be on vacation. They both enjoy the privacy of Montana."