Comics where time travel is involved in one way or another is a recurring theme in xkcd, as a sub part of all the comics that in general references time. Given the many paradoxes that can arises as soon as some kind of time travel is involved there are many possibilities for interesting comics.
Below is a list of comics that deals with time travel.
Pages in category "Time travel"
The following 13 pages are in this category, out of 13 total.