Are you quite sure of this? I know this is how it ought to be, and how it has traditionally been presumed to be. But there are people, right now, in positions of political authority who do want to criminalize abortion outside their own state's borders. Whether they can actually get away with it is another matter. YOU may not want to open that box, and you may be right that it will not be opened, but there are people just stupid and bigoted enough to be prying at it as we speak.
And is the Constitution unambiguous about this?
...snip...
It does not limit what a state can declare a crime, nor does it require the crime to be a felony, nor does it demand conviction or even a good case. Only a charge. If a State declares that seeking an abortion in another state is a crime, then a person who does so can be charged with a crime, and according to the Constitution can be extradited. Now of course you can say that this is ridiculous and unAmerican and this and that, but if you are a strict constructionist and originalist in your reading of the Constitution, there's room for some nasty stuff to bubble up. If you declare that seeking an abortion out of state is a crime, even a misdemeanor, you can charge that crime even if, by some other means, it is not legal to charge for actually getting it. Case law and custom and common understanding notwithstanding, there is no Constitutional guarantee of free travel between states.
Of course that will never happen. Ha Ha. Nobody is that stupid. Ha ha.