In our solar system, yes. We can practically do it with current technology.

Extrasolar planets, no. Not with current technology, not with any foreseeable technology. The distances are so vast that it would take tens of thousand of years to reach the nearest star. It would be possible, I guess, to build a generational ship and reach them, but then "we" are not reaching other planets, our descendants are and I think that's fundamentally a different question.