How far away is Neptune from the sun? The average distance of Neptune from the sun is 2,795,084,800 miles or 4,498,252,900 kilometers. Because its orbit is elliptical, its distance from the sun changes depending on where it is in its orbit. The closest Neptune gets to the sun is 2,771,087,000 miles or 4,459,630,000 kilometers. The farthest it gets from the sun is 2,819,080,000 miles or 4,536,870,000 kilometers.