Jaya
I'm just back from this trip, its a lot of flights and some really early starts unless they update the timings on some of the flights which would make it a lot better. Its a great trip, so much to see especially Easter Island.
We had limited time in Santiago even though we stayed there 4 times, so if you are looking to see more of the area such as San Cristobal Hill or go up the Costanera Center Torre (viewing tower) I'd suggest planning ahead to see if you can fit such things in. Unfortunately I didn't manage to fit these in even though I would have liked to. I've fed back that it would have been really helpful to have had some suggestions about what you could do in Santiago in the limited free time we had there and the time to allow for doing them.
Hope you have a great trip
Tim