The main operating base for United Airlines is Chicago O'Hare International Airport's Terminal 1 (ORD). With two concourses, B and C, Terminal 1 serves both domestic and international aircraft. Among the many services that United Airlines ORD Terminal provides are lounges for first-class travelers. The terminal has access to restaurants, shops, and transit choices.

United Airlines operates mainly from Terminal 1 at Chicago O'Hare International Airport (ORD), serving as its hub for both domestic and international flights. The terminal is divided into two concourses, B and C, which are connected by an underground pedestrian tunnel featuring colorful light displays. Passengers can access a wide range of services, including United Club lounges for premium travelers and Global Services passengers. Terminal 1 also offers various dining options, shopping outlets, and easy access to ground transportation. Additionally, the terminal’s modern amenities provide a comfortable travel experience, catering to the needs of both business and leisure travelers.