Summary Chicago O'Hare Airport ranks as the 3rd busiest in the US with 94 million available seats on flights in 2024. United Airlines dominates the market at O'Hare with over 44 million seats and hub-to-hub routes like SFO and Denver. Other major airlines like American, Spirit, Delta, and Southwest also have significant presence and routes at O'Hare.
Chicago O'Hare International Airport is one of the most important airports in the United States. The airport was opened in 1944 and has eight runways that are utilized in different conditions. The airport is famous for its approach over Lake Michigan, flying over the city's skyline and providing incredible views before landing.
According to OAG, ORD is the seventh-busiest airport in the world this month, by number of seats available. With 4,393,280 seats, ORD is the third-busiest airport in the US. Home to United Airlines and also a hub for American Airlines, the airport connected almost 74 million passengers last year.
Data from Cirium , an aviation analytics firm, shows there are more than 94 million available seats on flights to and from O'Hare in 2024. Fifty airlines have scheduled flights at ORD, and United Airlines has the most seats available. United is headquartered in Chicago, making O'Hare its busiest airport.
Nearly half of the available seats at O'Hare in 2024 are offered by United. The top ten airlines are in the table below: Airline Number of seats United Airlines 44,088,236 American Airlines 28,496,346 Spirit Airli.