How long would it take to get to Neptune?
Data as of July 2026
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 Found something out of date?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.