While your question has been answered, one hint that may help. Sign up for flight paging from United if you are carrying a phone that can get text messages. Once the plane touches down in Chicago you will get two pages while you are heading towards the gate. One will tell you you are arriving and which gate that is at, the other should tell you which gate your departing flight is from. You can check the airport map in the back of seatback magazine to get an idea as to where you have to go.

Always check the monitors to confirm, but just knowing if you turn right or left when you get off the plane really helps.