The classic Vans "Era" and "Authentic" shoes have no "Vans stripe". So leather-free versions are easy to find - just look for those with an all-canvas upper.

This is different for the classic "Sk8-Hi" and "Old Skool" shoes. Even those WITHOUT any suede in the toe and heel areas - that is those with an "all-canvas upper" typically still have a Vans stripe that is NOT canvas - and that Vans stripe is most commonly real (animal-source) leather.

One all-black and vegan "Old Skool" - the Vans stripe is synthetic leather - has been available for a while, at least 20 years. I think, almost exactly 20 years, actually, maybe 21 or 22.

I just saw these "Sk8-Hi" and "Old Skool" that have an all-denim upper. No leather! Good.