According to Deadline, Warner Bros. is on track for a Wonder Woman debut that could top over $175 million worldwide.
Those numbers break down as roughly $65 million-$75 million in the U.S and another $100 million internationally. The total would be more than the overall box office of Supergirl, Elektra and Catwoman combined. That said, Wonder Woman also has a larger budget to contend with; once you figure in the cost of the film, the adverting and production costs, you're looking at a $300 million overall budget.
Can Wonder Woman earn the kind of money its predecessors in the DCEU have earned? Suicide Squad has earned $745.6 million worldwide, Batman v Superman: Dawn of Justice has earned $873.2 million, and Man of Steel $668 million. As things stand now, Wonder Woman has the lowest production budget of all four films and the highest ratings, according to Rotten Tomatoes, where it's currently Certified Fresh at 97%.
Based on those numbers, it's not a stretch to believe that Wonder Woman may be the first DC Extended Universe film to break $900 million, but it may also beat Iron Man 3 ($1.2 billion) and give Marvel's Avengers films ($1.4 billion/$1.5 billion) a run for their money. A girl can hope.