United Airline offer non stop flight from Hong Kong to Chicago.I checked the price and the schedule for you from united.com.The price for an adult is $ 1692 US dollars.United ariline is using their 747-400 from Hong Kong to Chicago and from Chicago back to Hong Kong.Their schedule is follow.
United flight 896.Leaving Hong Kong on May-9 12:45 pm and arrived Chicago on May-9(please remember Chicago is centeral time zone in United States,which is 13 hours behind HK)@ 2:20 pm.It would take 14 hours and 35 minutes to complete this flight.
United flight895.Leaving Chicago O'Hare international airport 12:20 pm and arrive Hong Kong 4:45 pm.It would take 15 hours and 25 minutes to complete this flight.
Hope this information can help you.And I want to let you know the price I give to you is directly from their offical company webiste.If you reserve the ticket from the agent,the price may vary.
Hope you have a great trip to go to Chicago,please excuse me I am not able to type in Chinese.