Here's a nice little nonstop fare from Chicago to Memphis for $154 round-trip, including all taxes, on United/Delta. As seen by the screen shot below, we found seats departing from ORD on October 2, and returning from MEM on October 9. Other dates are also available from September through December. Tickets require a 21-day advance purchase. Avoid peak holidays.
For booking info, see our Fare Details.