UK VFR Weather Minima Explained Simply: Class G vs Class D

The Biggest Trap in the Air Law Exam

If there is one topic guaranteed to cost student pilots marks in their theoretical exams, it is Visual Flight Rules (VFR) weather minima.

Before we dive into the specific numbers, if you are struggling with the broader syllabus, you can find exactly what else you need to study in our complete How to Pass the UK PPL Air Law Exam in 2026 hub guide.

Here is the dead-simple breakdown of what you actually need to memorise to pass your exam and stay safe in the left seat.

The Golden Baseline: The 5 km Rule

Before we split the rules by airspace, start with the standard baseline. For most of your PPL flying below 10,000 feet AMSL (Above Mean Sea Level), the standard VFR weather minimum is:

• Visibility: 5 km
  

• Distance from Cloud: 1,500 metres horizontally and 1,000 feet vertically.
  

If you are flying in Class C, D, or E airspace, this rule almost always applies. However, because most General Aviation flying in the UK happens low down in uncontrolled airspace, the CAA tests you heavily on the exceptions.

Class G Airspace: The Low-Level Exception

Class G is uncontrolled airspace. When you are flying low in Class G, the rules relax significantly to allow light aircraft to keep flying safely even if the cloud base drops.

If you are flying at or below 3,000 feet AMSL (or 1,000 feet above the terrain, whichever is higher) in Class G airspace, the standard rule changes:

• Visibility: 5 km (which can be reduced to 1,500 metres if you are flying at 140 knots or less).
  

• Distance from Cloud: You must be clear of cloud and with the surface in sight.
  

The Exam Translation: In Class G, as long as you can see the ground, stay out of the actual clouds, and have at least 1,500 metres of visibility in your Cessna 152 or Piper Warrior, you are legally perfectly fine to fly under VFR.

Class D Airspace: The Strict Control Zone

Class D airspace surrounds major regional aerodromes (like Birmingham, East Midlands, or Edinburgh). Because you are sharing this airspace with commercial jets flying on Instrument Flight Rules (IFR), the relaxed Class G rules absolutely do not apply.

Even if you are below 3,000 feet AMSL in Class D, you must maintain the strict baseline:

• Visibility: 5 km
  

• Distance from Cloud: 1,500 metres horizontally and 1,000 feet vertically.

💡Pro Tip: The Cloud Separation Trap

You cannot just "stay clear of cloud" in Class D. If the cloud base is at 1,500 feet, and you are flying at 1,000 feet, you are only 500 feet vertically below the cloud. In Class G, this is perfectly legal. In Class D, it is illegal, and you would need to request a Special VFR (SVFR) clearance from Air Traffic Control to proceed.

How the CAA Tests This Concept

The e-Exam will test your reading comprehension with scenarios just like this:

• Scenario: You are flying a single-engine piston aircraft at 110 knots at an altitude of 2,000 feet AMSL in Class G airspace. The visibility is 3 km, and you are clear of cloud with the surface in sight. Are you flying in accordance with VFR?
  

• The Answer: Yes. Because you are in Class G, below 3,000 feet, and flying slower than 140 knots, the minimum visibility is 1,500 metres and you just need to be clear of cloud.
  

If that exact same scenario placed you in Class D airspace, the answer would be No, because you lack the 5 km visibility and the required 1,000-foot vertical separation from any clouds above you.

Stop Guessing, Start Passing

Airspace questions are practically guaranteed to show up on your exam. The only way to ensure you do not get caught out by the phrasing is to practise the exact types of scenarios the CAA uses.

Do not drop easy marks. Put your airspace knowledge to the test immediately and guarantee your pass.