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. Shuttle Bus Service will be provided.  View F​lyer

The Airport Transit System (ATS) is a quick and convenient way to get around O'Hare International Airport. The ATS is a free, 24 hour rail system that operates between the three domestic terminals (1, 2 and 3), the international terminal (5), all parking facilities, the Kiss 'n' Fly drop-off point, and the PACE Bus stop.​

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

The ATS is fully automated and spans 2.7 miles, accommodating up to 2,400 passengers per hour. From beginning to end- Terminal 1 to Parking Lot E -the total travel time is just nine minutes. All points on the ATS route system are fully accessible to persons with disabilities, with elevators available at each of the stops.

Free, fully accessible shuttle buses transport visitors to the ATS station from Economy Parking Lots​ E and G.

At each ATS stop, there are escorts in green jackets to help point you in the correct direction. You can ask them where to find your gate number, a specific parking lot or your current location.

During the upcoming months many important projects are planned at O'Hare. When work occurs on or near the ATS tracks one or more of the following precautions may be taken for the safety of passengers and employees:

  • The Intervals Between Trains May Be Longer Than Usual
  • Trains May Travel At Slower Speeds Through The Work Areas
  • Trains May Be Held For Longer Dwells In Station
  • Only One Track May Be Used For Both Directions Of Travel On Some Parts of the Guideway (Track)

​O'Hare ATS Schedule

Time of Day Number of Trains Headway (Time Between Trains)
​Midnight - 4:30 am 1 two-car train ​20 minutes, 38 seconds
4:30 am - 1:00 pm ​5 two-car trains 4 minutes, 08 seconds
1:00 pm - 8:00 pm ​6 two-car trains 3 minutes, 26 seconds
​​​8:00 pm - 9:30 pm 4 two-car trains 5 minutes, 13 seconds
9:30 pm - Midnight ​2 three-car trains 10 minutes, 19 seconds

O'Hare ATS Schedule (Typical During Projects with Single Tracking)

Time of Day Number of Trains Headway (Time Between Trains)
Midnight - 4:30 am 1 two-car trains 20 minutes, 38 seconds
4:30 pm - 11:00 am ​2 three-car trains 10 minutes, 19 seconds
​11:00 am - 8:30 pm
​3 three-car trains 6 minutes, 53 seconds​
​​​8:30 pm - Midnight 2 three-car trains 10 minutes, 19 seconds
“Due to construction activities related to the ATS expansion, service may be restricted to just one track in some areas.  This could result in longer waits between trains as indicated in the schedules below.  Please allow extra time for your ATS travel.”

Click here​ to view the ATS route and stops.

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 and will need to take the  ATS to the domestic terminals. You will need to clear security again at the domestic terminals. ​​