Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 209; Flight Crew Total 4780; Flight Crew Type 3906
Situational Awareness
Conflict NMAC; Inflight Event / Encounter Object
General None Reported / Taken
Airspace Structure; Procedure
We were arriving into ORD on the VEECK arrival. We were level at 11;000 ft. about 8.5nm south of CLUSO intersection. As we were receiving instructions from ATC; I was heads up and saw a black object on the horizon approaching. At first; I thought it was a mylar balloon; but as it approached; I could easily see that it was irregular in shape. As it came closer; it was clearly an unmanned aircraft. It was all black; and multi-rotor. It passed our left wing at our altitude. It was difficult to determine how far away it was; but couldn't have been more than 1;000 ft. away due to the details I could see. It was likely closer than that. The Captain was heads down at the time; and on the radio; and didn't see the [object]. She reported it to ATC. We didn't call it a NMAC at that moment; but probably should have. We were busy with ATC instructions for heading; altitude; and airspeed changes. The rest of the flight continued uneventfully.
B737 pilot reported sighting a drone while on the VEECK arrival into O'Hare airport at 11;000 feet.