Here a nice itinerary that I found: (apologies for the jumbled state of the information)
Routing is ORD-BOS-FRA-ZRH-IAD-IND-ORD. All in price is $898.95. You can book this (hopefully) by clicking 'Multi-city' on united.com; if that fails, pay $5 more by booking with one of United's very capable and professional agents at the International desk.
Chicago, IL to Zurich, Switzerland: 4697 miles 14 hrs 0 min
United Airlines United Airlines Flight UA538 on a Boeing 737 (jet) in coach class
Departs Chicago, IL (ORD) Fri, May 6 5:00p 2 hrs 29 min
Arrives Boston, MA (BOS) 8:29p
Layover in Boston 1 hr 21 min
United Airlines United Airlines Flight UA8858 on an Airbus A340 (jet) in coach class
(operated by Lufthansa Airlines as Flight LH421)
(dinner, snack)
Departs Boston, MA (BOS) Fri, May 6 9:50p 7 hrs 5 min
Arrives Frankfurt, Germany (FRA) Sat, May 7 10:55a
Layover in Frankfurt 2 hrs 10 min
United Airlines United Airlines Flight UA9032 on an Airbus A320 (jet) in coach class
(operated by Lufthansa Airlines as Flight LH3724)
(refreshments for purchase)
Departs Frankfurt, Germany (FRA) Sat, May 7 1:05p 55 min
Arrives Zurich, Switzerland (ZRH) 2:00p
Note: The flight from Boston (BOS) to Frankfurt (FRA) is overnight.
Note: You must change terminals in Boston (BOS).
Zurich, Switzerland to Chicago, IL: 4794 miles 15 hrs 17 min
United Airlines United Airlines Flight UA937 on a Boeing 767 (jet) in coach class
(lunch, snack, movie)
Departs Zurich, Switzerland (ZRH) Sun, May 22 11:45a 9 hrs 15 min
Arrives Washington, DC (IAD) 3:00p
Layover in Washington 2 hrs 20 min
United Airlines United Airlines Flight UA7709 (unknown aircraft) in coach class
(operated by UNITED EXPRESS/CHAUTAUQUA)
Departs Washington, DC (IAD) Sun, May 22 5:20p 1 hr 49 min
Arrives Indianapolis, IN (IND) 6:09p
Layover in Indianapolis 41 min
United Airlines United Airlines Flight UA7709 (unknown aircraft) in coach class
(operated by UNITED EXPRESS/CHAUTAUQUA)
Departs Indianapolis, IN (IND) Sun, May 22 6:50p 1 hr 12 min
Arrives Chicago, IL (ORD) 8:02p
For future reference, consult:
http://matrix.itasoftware.com/cvg/dispatch/
By the way, the 'unknown aircraft' on the IAD-IND-ORD route is the new United Express Embraer E170; you'll enjoy it!