This can also be expressed as:

* 30.1 astronomical units (AU), where 1 AU is the average distance between the Earth and the Sun.

* 2,794,570,000 miles

* 4,498,252,900 kilometers

It's important to note that Neptune's orbit is not perfectly circular, so its distance from the Sun varies throughout its year. At its closest point (perihelion), it's about 4.45 billion kilometers away, and at its furthest point (aphelion), it's about 4.55 billion kilometers away.