Connecting Traveler | Chicago O’Hare International Airport (ORD)

Connecting Traveler


There are four terminals at O'Hare International Airport that you can connect through:

  • Terminal 1​
  • Terminal 2
  • Terminal 3
  • Terminal 5

Visit our airlines page to reference which airlines operate out of each terminal.

Domestic Connections

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.​​

Passengers with domestic connections in Terminal 5 may travel from Terminal 1-3 via the Terminal Transfer Bus [TTB Service Has Been Temporarily Suspended] (boarding pass required) or via the AT​S​.

International Connections

While most international flights depart from Terminal 5, some depart from Terminals 1-3. Please visit our airlines page​ to reference which terminal an airlines operates from. 

Terminal 5 is not connected to the domestic terminals and is accessible via the Airport Tran​sit 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 Terminal Transfer Bus (TTB) from Terminal 3 to Terminal 5 and bypass the security checkpoint in Terminal 5. The Terminal Transfer Bus service is year round with operation hours as follows: 11:00 am - 9:00 pm. If you are arriving​ into the domestic terminals and need to collect your luggage (exit the security side of the airport) and recheck in T5, you will not be able to use this service. ​​

TTB SERVICE HAS BEEN TEMPORARILY SUSPENEDED - TTB service takes travelers from the domestic terminals (1, 2, & 3) to Terminal 5 without having to exit security or be rescreened in Terminal 5 at the TSA​ checkpoint.

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 AT​S 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 AT​S​ route below, outlined in red. There are stops in each terminal as well as the economy parking lots​