connectingflights

Connecting Traveler


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.


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.​​


International Connections

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. The transfer bus service is year round with operation hours as follows: 10:30 am - 8 pm. 

Transfer Bus Service Terminal 3 Pickup Locations

  • Gate G17
  • Gate K20

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​

ats
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