Southwest is offering "Tick Tock Tuesday" fares for $69 each way between Minneapolis/St. Paul and Chicago Midway for $69 if tickets are purchased before midnight Tuesday, April 3. Fares are available for travel on Tuesdays, Wednesdays and Saturdays for travel between April 17 and May 23. The $69 price includes taxes and fees and a free checked bag.
Other fares from several cities are also on sale. Check the site for details.