Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 18:10 and arrives at Baltimore International Thurgood Marshall Airport at 21:15.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 1250 Km. So the average speed is roughly 600 Km.
There is an 1 hour time difference between Chicago and Baltimore