Connection between Terminals
For transferring between domestic terminals, by the Pedestrian Tunnel Level is possible to get from one each other and also to the main parking garage
In addition, free shuttle buses transport (every 5 to 15 minutes) 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.
On the other hand, access within the airport complex can be accomplished using O’Hare’s Airport Transit System (ATS), a 3 mi (4.8 km) long automated people mover system, which just takes ten minutes to complete its trip.
The free fully-automated train system transports passengers to and from Terminals 1, 2, 3 and 5, as well as the Multi-Modal Facility (MMF) for rental cars, Economy Parking Lot F, Kiss 'n' Fly, Pace buses and Metra.
In total, there are 5 stations served at T1, T2, T3, T5 and the new one at the MMF
While (ATS) operates from 10:30 a.m. to 8:30 p.m. daily, shuttle buses provide 24/7 service.