travel through time

which one is correct?
travel into the past/future or travel to the past/ future

They are both fine.


As they are both travel in an imaginary sense, I would suggest ‘into’ for both past and future.

Incidentally an early science fiction novel on this topic can be found in The Time Machine by HG Wells. The Time Machine (Penguin Classics) by H.G. Wells (Paperback - 31 Mar 2005)


Thank you very much.