If you are flying in to O'Hare - one of my favorite places when I would arrive on a late night flight was the Gaslight Club at the O'Hare Airport Hilton right adjacent to the terminals.
http://www.gaslightclubs.com/#!large-grid/c7il

if you want great pizza go here

Another place would be Lou Malnatis or another one is Gino's East.  They also have great pizza.