The northwestern terminus of the Chicago Transit Authority's Blue Line, it is a subway station with two island platforms serving three tracks, situated under the parking garage for Terminals 1, 2, and 3.

It is also the only station without coordinates in Chicago's grid system, the only underground terminus, and is the only terminal that does not directly connect to any CTA or Pace buses.

O'Hare station opened on September 3, 1984, as the terminus of an extension of the West-Northwest route from its former terminal at River Road.

The column-free platform is paved with concrete and the walls are constructed of wavy glass block with backlighting.

[citation needed] Take Airport Transit System to the Multi-Modal Facility (MMF) Stop to access connections Airport Transit System Metra Pace Media related to O'Hare (CTA) at Wikimedia Commons