Witnessed a bright light in the sky before it seemed to go straight up and disappeared

Saw a bright light to the north west, seemed to be coming south east straight over ohare airport. It did not have any blinking marker lights light aircraft, made no sound, did not flicker like one of those lanterns that float away. This stayed the same brightness as it moved slowly across the sky. It was higher than the incoming aircraft but much to low and bright to be something in orbit. After reaching just about over our heads the object seemed to begin to slow and out of nowhere went straight up and disappeared. I checked flight trackers, satellite trackers everything I could think of and nothing was taking that flight path at that moment.