Chicago O'Hare handled more aircraft movements than any other airport in the world in 2025 — a reflection of a hub shared by two of the three largest US airlines, United and American, with far more regional flights than a typical mega-airport. The current schedule feed lists 298 airports in 52 countries connected to Chicago.
The airport is named after Edward 'Butch' O'Hare, a Navy fighter pilot and Medal of Honor recipient. The tunnel between United's B and C concourses is lined with Michael Hayden's neon installation 'Sky's the Limit', probably the most photographed walkway in American aviation.
Chicago O'Hare International Airport is the 6th busiest airport in the world — it handled 84,856,018 passengers in 2025, according to ACI World's annual ranking.
The most frequently served routes for Chicago O'Hare International Airport connect to Boston (BOS), Atlanta (ATL) and New York (LGA).
The longest connected route for Chicago O'Hare International Airport reaches Manila (MNL). This non-stop flight covers a distance of 8,121 miles (13,070 km).