Neptune is about 4.5 billion kilometers (around 2.8 billion miles) from the Sun on average, which is roughly 30 times farther away than Earth is from the Sun.

Quick Scoop: Neptune’s Distance

  • Average distance: About 4.5 billion km (2.8 billion miles).
  • In astronomical units (AU): Roughly 30 AU from the Sun (1 AU = Earth–Sun distance).
  • Closest point (perihelion): About 4.45 billion km from the Sun.
  • Farthest point (aphelion): About 4.55 billion km from the Sun.

Because Neptune’s orbit is slightly elliptical, its distance from the Sun changes a bit as it travels, but it always remains the most distant major planet in our solar system.

TL;DR: Neptune orbits the Sun at an average distance of about 4.5 billion km (2.8 billion miles), or roughly 30 AU.

Information gathered from public forums or data available on the internet and portrayed here.