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

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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.​​

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​.


ATS service is operating 10:30 a.m.-10:30 p.m. daily. Over the coming weeks, we expect to expand the days/times of operation with the goal of returning to full-time operations in early 2022.

Shuttle buses continue to provide 24/7 service.​


International Connections

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

The AT​S at O'Hare is returning to phased service, see the current operating schedule and more information about the ATS here​.
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​In order to maintain a travel connection between all of O’Hare’s terminals and parking lots, the CDA will continue to operate shuttle buses to transport passengers and employees between terminals (Terminals 1, 2, 3 and 5) and from the terminals to each economy parking lot (Lots E, G, H); the Multi-Modal Facility, where Lot F and rental cars are housed; and the Metra O’Hare Transfer station. The buses will operate continuously to ensure prompt and reliable service while the ATS resumes service.​


  • Buses arrive every 5-15 min
  • Bus stops are located on both the upper level and the lower level, depending on the route and terminal:
    • Buses to parking lot F and for rental cars stop on upper level (starting April 1)
    • Buses to all terminals and all other remote parking lots (E, G, H) stop on upper level from the domestic terminals (1,2 & 3) and lower level in Terminal 5.
  • ​Buses from the Multi Modal Facility are located on the main level
    • ​​Buses are routed to specific terminals and arrive every 5-15 min

If connecting between domestic Terminals 1, 2 & 3, you DON’T have to leave the secured side and take the shuttle buses, you can simply follow the overhead signage to guide you between all domestic terminals.

The International 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​

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