Pluto takes 248 years to orbit the Sun.
Pluto was discovered on Feb. 18, 1930, using the Lowell Observatory in Flagstaff, Arizona. American astronomer Clyde Tombaugh found a moving object clearly beyond the orbit of Neptune. That object was later called Pluto, the ruler of the Greek underworld in that culture’s mythology.
There’s a long-running debate about whether Pluto is a planet or a dwarf planet. Concerning its orbit, however, astronomers don’t disagree that the world has yet to complete a single orbit since Tombaugh first spotted Pluto in imagery.
It takes Pluto 248.09 Earth years to complete one orbit around the sun. Plug that information into a timeanddate.com calculator along with its discovery date, and you’d find that Pluto will complete its first full orbit since its discovery on Monday, March 23, 2178.