Blue Line stations downtown include La Salle, Jackson, Monroe and Washington. The Orange Line from Midway Airport connects with the Blue Line at Clark/Lake station.

The O'Hare CTA station is located on the lowest level of the Parking Garage in the main terminal area. Follow the signs for Terminals 1, 2 or 3. Passengers for Terminal 5 go to Terminal 3 and take the ATS transfer train to Terminal 5.

Journey time from Downtown to O'Hare is around 45 minutes. Trains run every ten minutes during the day.