The two are expected to appear together for a variety of events beginning at the film's worldwide press junket in Los Angeles from October 28 to November 3, according to Deadline.
Stewart and Pattinson will also reportedly both attend The Twilight Saga: Breaking Dawn - Part 2's world premiere in Hollywood on November 12 and European screenings in London, Madrid and Berlin from November 14 to 16.
These will be the first joint public appearances for the Twilight couple since Stewart admitted to a "momentary indiscretion" with married director Rupert Sanders.
Stewart and Pattinson were initially rumoured to have split in June, but have reportedly reconciled in recent weeks.
The Twilight promotional tour will also see Pattinson appear in Australia later this month, while Stewart travels to Japan.
The Twilight Saga: Breaking Dawn - Part 2 opens in cinemas on November 16.
Watch a trailer for the film below:
The Twilight Saga: Breaking Dawn - Part 2 poster gallery: