September 20, 2005 September 22, 2005 Depart Chicago, IL for about 8hrs of driving &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Take I-90 W (about 470 miles) About 8hrs of driving &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Take I-90 W (about 470 miles) About 8hrs of driving &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Take I-90 W (about 219 miles) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Take the US-14 W exit- EXIT 9- toward RANCHESTER-DAYTON / GREYBULL-LOVELL / YELLOWST ONE-TETON NATL PARKS. (0.4 miles) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Turn LEFT onto US-14 (80.1 miles) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Turn RIGHT onto N 6TH ST / US-310 / US-14 / US-16 / US-20 / WY-789.<br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Continue to follow US-14 / US-16 / US-20 into East Entrance of park (64 miles) Arrive at <a href="destination.jsp?name=yellowstone">Yellowstone National Park</a> East Entrance Chicago to Yellowstone</br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;total mileage = 1392.31 miles</br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;total time = 21 hours 30 minutes