Transportation Between Terminals

ATS

The Airport Transit System (ATS) operates 10:30 a.m. to 8:30 p.m. daily.

Shuttle buses continue to provide 24/7 service.​

CDA will 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.


  • 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.
    • 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 CDA is committed to providing a quick and reliable bus shuttle service as the ATS modernization is finalized.



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


Terminal Transfer Bus (TTB) - Service Temporarily Suspended 

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. Shuttles to transport passengers between all terminals and remote parking are still operating 24/7, those shuttles pick up on the Upper Level roadway (Ticketing Level). ​

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 departing from Terminal 5, you have two options: 1.) you can take the ATS and pass through the security check point in Terminal 5 or 2.) you can take a Terminal Transfer Bus (TTB) from Terminals 1 and 3 to Terminal 5 and bypass the security check point in Terminal 5.

The Terminal Transfer Bus service is year round with operation hours as follows: 11:00 am - 9:00 pm.

Terminal Transfer Bus (TTB) Terminal 1 and Terminal 3 Pickup Locations

  • Gate B1 (T1)
  • Gate G17 (T3)
  • Gate K20 (T3)
  • Gate L24 (T3)
  ​​​​​​​​​​​​​​​​​​​​​​​​​

If you arrive at O'Hare on an international flight and have a connecting domestic flight, you will arrive at Terminal 5. You may only use the TTB if you have rechecked your luggage and if you have a boarding pass for your connection. Proceed through Terminal 5 security to Gate M1. If you are arriving internationally and must check-in for your connecting flight, you may not use this service. 

​​​​​​​​​​