Overland Park, Kansas and Wichita, Kansas are 170 miles apart, as the crow flies. If you are driving from one city to another, it will take about 3 to 3.5 hours and you will drive between 180 and 200 miles, depending on the route you take.
The distance between the starting point and the destination is 187mi, (301km), and with reasonable traffic conditions it will take approximately 3 hours of driving time.