Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 08:50 and arrives at Seattle Tacoma International Airport at 15:23.The flight has a short stop at San Francisco.
The flighttime is about 8h 33m. The distance travelled ("as the bird flies"): 3824 Km. So the average speed is roughly 447 Km.
There is an 2 hour time difference between Chicago and Seattle