The bus will board in the loading bays at the rear of the Greyhound Bus Station. Enter the station from the S Santa Fe St. entrance. Walk through the station and exit to the rear through the double doors towards the back of the station. FlixBus will board in bus bay #5.
The ticket counter can be found on the upper portion of the CTA station between Gates V and U. The bus slip arrives and departs from Gate X around the corner from the ticket counter.