Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
ATC Issue All Types; Inflight Event / Encounter Fuel Issue
Flight Crew Diverted
Airspace Structure; Procedure
While descending to start our approach into Incheon; we were given vectors off the approach and told there was unknown drone activity near the airport. We heard other aircraft get holding instructions. We were told we were number 8 for [the] approach. We all started doing our own analysis of how much time we had before we needed to divert due to fuel. Captain made the decision to declare minimum fuel. Approach told us we were number 7 now so the Captain requested to go to the alternate. We were vectored to our alternate; ZZZZ. The approach to ZZZZ was uneventful. We refueled and proceeded to our destination ICN also uneventful. There were no other factors besides the unknown drone not allowing us to land in ICN. No suggestions here. Drones are an unforeseen event.
Air carrier First Officer reported diverting to the alternate airport due to low fuel caused by landing clearance delay resulting from UAV activity in the vicinity of the airport.