Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy noticeChicago O'Hare Airport is forecast to overtake the world’s busiest hub — Hartsfield-Jackson Atlanta International — for the airport with the most scheduled flights. According to aviation data firm Cirium, Chicago has 437,191 scheduled flights in the first half of 2026, compared with 389,663 for Atlanta. These statistics put Chicago on a trajectory for becoming the world’s busiest airport. The busiest month for Chicago in the first half of 2026 is scheduled to be May 2026, with over 81,000 flights.