There are four terminals at O'Hare International Airport that you can connect through:
- Terminal 1
- Terminal 2
- Terminal 3
- International Terminal 5
airlines page to reference which airlines operate out of each terminal.
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
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.
In order to maintain a travel connection between all of O’Hare’s terminals and parking lots, the 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 while the ATS is closed.
- 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 CDA is committed to providing a quick and reliable bus shuttle service as the ATS modernization is finalized.
View map of shuttle bus service routes.
The Airport Transit System (ATS) at O'Hare will return to service as soon as the system is operating safely and reliably. Substantial progress has been made during the ongoing testing, system integration, and commissioning process and the Chicago Department of Aviation (CDA) continues to work aggressively with its contractor to complete the project.
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: 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.
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).
Terminal Transfer Bus (TTB) Terminal 1 and Terminal 3 Pickup Locations
- Gate B1
- 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.
Our international traveler page contains all the information you will need for an international connection. You can also use our Transfer Guide found
You can view the ATS route below, outlined in red. There are stops in each terminal as well as the
economy parking lots.