How long would it take to get to Neptune?
545 yearsby jet, without stopping
Neptune comes within 4,300 million km of Earth at closest approach. In a straight line at airliner speed that's 545 years of continuous flight. The fastest spacecraft ever launched would need 8.4 years.
▶ See how far Neptune really is
The honest timetable
Family car (100 km/h)
4,905 years
Jet airliner (900 km/h)
545 years
New Horizons — fastest launch ever (58,500 km/h)
8.4 years
Light (299,792 km/s)
4.0 hours
Those are straight-line times at the moment of closest approach — the absolute best case. Real spacecraft can't fly straight there: they follow long curved transfer orbits, sling around planets for free speed, and have to slow down at the other end. Voyager 2 needed 12 years to reach Neptune, arriving in August 1989 — still our only visit.
Winds on Neptune top 2,100 km/h — the fastest in the solar system — yet it receives 900× less sunlight than Earth.
See the gap for yourself: open Neptune in the interactive view, switch to 1:1 scale, and try to find Earth from there.
Keep going
✓ Facts verified July 2026
Every figure on this page is a real, rounded value checked against primary sources. Found something out of date? See how we keep it accurate.