There are four terminals at O'Hare International Airport that you can connect through:
- Terminal 1
- Terminal 2
- Terminal 3
- International Terminal 5
Visit our airlines page to reference which airlines operate out of each terminal.
The domestic terminals, Terminals 1-3, are connected and all easily accessible from each other. If you arrive on a domestic flight and have a connecting domestic flight, you will have access to Terminals 1-3 upon arrival without having to clear the security checkpoints. If you have a connecting domestic flight via two different carriers, please contact your airlines for detailed instructions and information regarding checked luggage.
The International Terminal 5 is not connected to the domestic terminals and is accessible via the Airport Transit System (ATS). If you arrive on a domestic flight and must connect to an international flight, you have two options: 1.) you can take the ATS and pass through the security checkpoint in Terminal 5 or 2.) you can take a transfer bus from Terminal 3 to Terminal 5 and bypass the security checkpoint in Terminal 5 (note* this transfer service is not offered during the winter months, when in service, operation hours as follows: 10:30 am - 8 pm). If you arrive at O'Hare on an international flight and have a connecting domestic flight, you will arrive at Terminal 5 and will need to take the ATS to the domestic terminals. You will need to clear security again at the domestic terminals.
Our international traveler page contains all the information you will need for an international connection. You can also use our Transfer Guide found here.
You can view the ATS route below, outlined in red. There are stops in each terminal as well as the economy parking lots.