The problem here is that the distances are so vast, that it would require an incredible amount of time given the limits of known technologies.
A star-traveler would have to traverse these vast distances by either approaching the speed of light or by circumventing the theoretical limit of v/c = 1.0. Theoretically, if a UFO approached light speed, it's occupants would enjoy time ratio benefits that a stationary observer would not. This time-ratio relation, originated by H.A Lorentz and incorporated by Einstein as a cornerstone of his Special Theory of Relativity, says to square the velocity ratio, subtract from one, and take the square root to obtain the ratio of on-board time to the time for the stationary observer. I.E. if the UFO was traveling at a speed of v/c = 0.999999, then it covers one light year of distance in 0.00141 year or 12 hours and 35 minutes.