Ibiza (Eivissa) to London is about 1,408 km and usually takes around 2h 30m in the air. The track it follows runs over the Iberian Peninsula, Western Europe, the British Isles, and the North Sea.
Over 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.
On a flight this short most of the time is climb and descent, so any small movements come early and late; the cruise in between is brief but calm.