Transportation Between Terminals (ATS & TTB)


The O'Hare Airport Transit System (ATS or "people mover") is currently closed Monday to Friday through the winter season for construction on the modernization and expansion of our system. 

Beginning in January 2019, the system will move to a 24/7 closure to finalize modernization efforts. 

Shuttle Bus Service is provided to passengers to ensure prompt and reliable service while the ATS is closed for improvements.  

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Travel Alert: ATS Schedule for 2018 Holidays and 2019​


Look for this sign when trying to locate the Transit System.

The Airport Transit System (ATS) is a quick and convenient way to get around O'Hare International Airport.  An overall modernization to the ATS is underway to upgrade technology and enhance performance of the existing 25-year-old system. These improvements include the addition of a  larger new fleet of cars, that will double capacity of the system, providing passengers a faster and more streamlined connection throughout the airport. In the next year, the recently opened  Multi-Modal Facility (MMF)​ will incorporate an extension of the ATS to service a new train station on the second floor of the building.

An expanded and modernized ATS will benefit O'Hare travelers moving between the terminals, economy parking lots and the new MMF. The new system is scheduled to be completed by Fall 2019. 

Terminal Transfer Bus (TTB)

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 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: 10:00 am - 8:30 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. 

Terminal Transfer Bus (TTB) Terminal 3 Pickup Locations

  • Gate G17
  • Gate K20
  • Gate L24 

If you arrive at O'Hare on an international flight and have a connecting domestic flight, you will arrive at Terminal 5 you will not be able to use the TTB.​​