Actually, not only is it possible, but it’s already been done, albeit not in the conventional, Hollywood style.
Time is inseparable from space, which is why Stephen hawking used the term spacetime. General relativity decisively proves that time dilation exists, and is dependant on your speed.
To simplify a highly complex field of physics : the faster you go, the slower time becomes relative to you.
So, let’s say you hopped onto a rocket ship travelling with prodigious speed, whilst a friend of yours stayed back on Earth. Now you hurtle off into space, and return in, say 3 hours(as indicated on a clock within the ship). During the same time(pun intended) an entire day would have passed for your friend, yet only 3 hours have gone by for you.
So you just skipped a day and travelled into the future.
A far less pronounced example of this phenomenon is via the atomic clocks on the international space station, where time
is about .007 seconds slower than on Earth.
Furthermore, due to the immensity of space, light takes time to travel so when we look at the stars at night, we see things not as they are but as they were. Some stars may have long ago gone extinct and turned into supernovas. But their light, emitted wins ago, is only reaching our eyes just now. Amazing to consider that a star you see at night might not even be there anymore.