N eed advise on getting from Greyhound bus station to Chicago O'Hare Airport?

Answer 1

Get to the 'El', (subway) and take the blue line out to O'Hare. It should be $2. Once you get onto any El train, you should be able to transfer at any station without paying again.

There should be maps of the train layout in the stations.

Sorry I can't be of more help.

Just ask people at a bus stop if that bus goes to the El. Like the letter L.