If you have checked luggage, then your luggage will go onto your final destination. So assuming you don’t have checked luggage.

Also, assuming you booked the flight with money and not miles. If you’re frequent Flyer on the airline and skip the last leg, it is possible you will be penalized by the airline.

Some folks suggest that you call or contact the airline to say you can’t make the last leg. I would personally find this ill informed on a dangerous practice.

So there’s no clear answer to your question – it depends on the airline, how you booked it, And whether it’s something you’ve done before on the airline. Possibly no consequences if it’s an airline you don’t use much and you booked with money.