How long does it take a satellite to get to Pluto?

Answer 1

New Horizons probe was launched in 19 January 2006, and is projected to make a flyby of Pluto 14 July 2015. Its travel is thus expected to take about nine and a half years.

The New Horizons mission utilizes gravity assist (aka gravitational slingshot) maneuver near Jupiter to gain more speed, and to save on launch weight.*

While technically journey can be made much faster - and somewhat more directly - than New Horizons one, its launch would require far larger rocket and boosters and thus be prohibitively expensive.

Travel to Pluto might take slightly longer in the near future as Pluto will be heading toward it's aphelion (and thus distancing itself from earth) the travel time (for a spacecraft with significant scientific payload) in the near future will be somewhere around, or slightly below, ten years.

With more advanced technology, such as VASIMR thrusters, the travel time could theoretically be cut to less than a year.

* Increased launch weight generally means more fuel, which in turn equals more speed (in form of more thrust)