Buy at the CTA station at O'Hare.
You will come into either T1 (main UA terminal) or T2 (additional UA gates).
Once you have your bags, proceed via the underground tunnels to the CTA station (underneath the O'Hare Hilton).
http://www.transitchicago.com/airports/
http://www.transitchicago.com/travel...achmentId=4760
Last edited by Non-NonRev; Jun 26, 2016 at 7:17 pm