Pluto's average distance from the Sun is about 5.9 billion kilometers (3.67 billion miles). However, it's important to note that Pluto follows an elliptical orbit around the Sun, so its distance can vary significantly depending on its position in the orbit.
As for when Pluto will be closer to the Sun again in its orbit, it completes one revolution around the Sun in approximately 248 Earth years. The last time Pluto was closest to the Sun (perihelion) was on September 5, 1989. Therefore, if we add 248 years to that date, we can estimate that Pluto will be closer to the Sun again in its orbit around the year 2237.
Please keep in mind that astronomical predictions can have uncertainties, and the exact timing of future perihelion passages may vary due to gravitational interactions with other celestial bodies.