Malaga to London is about 1,676 km and usually takes around 3h in the air. The track it follows runs over the Mediterranean, the Iberian Peninsula, Western Europe, the British Isles, and the North Sea.
Over the Mediterranean, the North Sea, the Iberian Peninsula, and Western Europe the air is usually calm and settled. Nearer the British Isles the weather turns more Atlantic and the ride can be livelier for short spells, still firmly within the routine. This track threads jet-stream latitudes, so in winter you may feel a few minutes of light, choppy air high up; summer usually rides calmer.
For most of a flight this length you are at a steady cruise above the weather, where the ride is smooth; the livelier moments, if any, are short.