Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 15:45 and arrives at Portland, Oregon Portland International Airport at 18:05.
The flighttime is about 4h 20m. The distance travelled ("as the bird flies"): 3857 Km. So the average speed is roughly 890 Km.
There is an 2 hour time difference between Chicago and Portland, Oregon