If you go to SCL, try and cut out 3 days to go to Easter Island. Is a fantastic place to go and you could stay at the Explorer there (as I did, although a bit expensive compared to the rest). I also went to a Hacienda for a few days which I can also recommend.
LATAM do J return for 700 GBP which is good value considering it's a 5 hour flight with long haul seating on a 787.