United Airlines ORD Terminal is based mostly in Terminals 1 and 2 of O'Hare International Airport (ORD) in Chicago, Illinois. This is one of the airline's primary hubs. The majority of departures and several international flights use Terminal 1, while Terminal 2 consists of some domestic departures and United Express operation. Check-in can be done online, through the mobile app, or by applying at self-service kiosks. O'Hare airport offers multiple eating, shopping and lounge experiences such as United Club and Polaris Lounge to first class passengers and ground transportation options such as taxi, ride-shares, rental car, and CTA Blue Line to easily travel into the city. Arrival 2-3 hours prior should not present a problem at this airport.