Leuchars is currently home to three squadrons of RAF Tornado F3's. They are No. 111 Squadron, No. 43 Squadron & No. 56 (Reserve) Squadron . Nos. 43 and 111 Squadrons are operational units, each with a strength of 16 aircraft. No. 56 Squadron is an Operational Conversion Unit, which trains aircrew on how to use the F3. The station is also home to No. 125 Expeditionary Air Wing.
Leuchars is also the base for No. 612 (County of Aberdeen) Squadron, Royal Auxiliary Air Force, an RAF Mountain Rescue Unit, and is the airfield from which the local Air Training Corps units and officer cadets from Aberdeen, Dundee and St. Andrews University Air Squadrons fly from, using the Tutor T1. No. 612 Squadron RAuxAF is an air-transportable surgical squadron.
The other RAF air defence base is RAF Leeming, North Yorkshire.
RAF Leuchars is home to the annual Leuchars Airshow. This usually takes place on a Saturday in September.
No 125 Expeditionary Air Wing (EAW) was formed at Leuchars on 1st April 2006. The wing encompasses all the flying units based at the station. The station commander is dual-hatted as the commander of the wing.