There is a pretty incredible deal today on Turkish Airlines website for roundtrip travel from Chicago to Istanbul starting at $505. Rate includes all taxes and fees, making this an amazing value!

Application Period :
Travel Dates: Valid for outbound travels between 05 OCT 2011 – 10 DEC 2011 and 10 JAN 2012 – 10 MAR 2012.
Ticketing Dates: Tickets must be issued between 13 MAY 2011 – 29 MAY 2011 (incl.)

Application Rules:
Minimum Stay: Sunday Rule
Maximum Stay: 3 Month

For Further Information And Bookings Please Call +90 212 444 0 849

You can also make your reservations online as I was able to find various dates available at this price point.