Flare and flair are homophones, and homophones are often confused. Flare tends to be used when the word should be flair. I think this is because we are more used to seeing and using flare (it has a wider range of uses).

Flair

• A natural talent, aptitude or ability.
• Stylishness (usually distinctive) or originality.

Flare

• A device that produces a sudden blaze of light.
• A blaze of light used to illuminate, alert, or signal distress or location.
• A part that spreads outwards from a narrow to wider shape.
• Flares are trousers that have a ‘flare’ at the bottom of each leg.*
• An unsteady flame or a sudden burst of flame.
• A sudden explosion in the chromosphere and corona of a star that results in an intense burst of radiation (astronomy).
• The extraneous light on film that is caused by reflections inside the camera (photography).
• The curve of a vessel’s bow (outwards and upwards), which is designed to throw the water outward when moving.
• To break out suddenly (temper, conflict) or a burst of intense emotion.
• To glow with a sudden intensity (light or someone’s eyes). It can also mean ‘dilate’ or ‘widen’ in terms of nostrils.
• An illness can flare up – a sudden occurrence or recurrence. Also used to apply to violence or temper.

*Before my time.