It is quite common to see car headlights becoming dull, cloudy or hazy, that may be caused by road debris. It is also essential to replace headlights as and when they slip in brightness, to ensure safe driving. However, the price of a headlight largely depends on the make of the car. The average cost of a headlight is $120, exclusive of the labor charges. It may either warrant changing the bulb alone or the headlight unit as a whole, as the case may be.