Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 08:30 and arrives at Seattle Tacoma International Airport at 21:10.The flight has a short stop at New York.
The flighttime is about 14h 40m. The distance travelled ("as the bird flies"): 3824 Km. So the average speed is roughly 261 Km.
There is an 2 hour time difference between Chicago and Seattle