https://www.npr.org/2023/08/23/1194998452/skiplagging-airfare-flying-skiplagged-american-airlines
This is the best source i found about it. It sounds like it's legal but they are likely to cancel your return flight.
this post was submitted on 23 Oct 2023
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It's no illegal in the sense that the airline can't put you in jail. On the other hand, it's also not illegal for the airline to cancel the rest of your ticket (leaving you stranded) and choose never to do business with you every again.
Thanks for the replies. You've convinced me not to try it.
Additionally, I just realized that you're flying internationally. There might be weird passport/visa issues. I'm glad you've decided not to try it.