I strongly suggest you get an earlier flight. You might make it, but there's a good possibility you won't. And then you have to get to the next port yourself.

Traffic can be unpredictable, customs can be unpredictable, South American airline flights can be unpredictable. Any airline flights can be unpredictable. You're setting yourself up for a headache.

Are you sailing around Cabo de Hornos? It's a great trip, have fun!