Terminal 1
The United terminal. Concourses B and C. It also holds some partner-airline flights.
Chicago O'Hare International Airport (ORD) terminal guide
Chicago, Illinois KORD #3 US airport by passengers
How ORD is laid out and how to move between buildings.
Terminals at ORD
Terminal 2
Concourse E and F. Used by Delta, Air Canada and others. Close to the CTA Blue Line station.
Terminal 3
The American Airlines terminal, with Concourses G, H, K and L. Also hosts Alaska and some other airlines.
Terminal 5
The international terminal. International arrivals clear customs here. Many foreign carriers and some domestic carriers use it.
Moving between terminals
The free Airport Transit System (ATS) is an automated train that links Terminals 1, 2, 3 and 5, and the long-term parking and rental car facility. It runs frequently. Terminals 1, 2 and 3 are also connected by walkways on the departure level.
Reviewed October 8, 2026. Confirm details on the official airport website. Spotted a change?
Frequently asked questions
Which terminal is United in?
Terminal 1 for most flights and some in Terminal 2. Check your boarding pass.
Are Terminals 1, 2 and 3 connected?
Yes. They are linked by walkways on the departures level and by the free ATS train.