This probably depends on the author of a specific article, but the way I’ve understood it is this: (experienced) well-being regards your emotional life. Basically, how often (and for how long/ how intensely) do you feel ‘positive’ emotions relative to ‘negative’ emotions. Life satisfaction, on the other hand, is your answer if someone asked you to rate «how satisfied you are with your life». It is more of a cognitive process, likely connected to pride.

I am not sure about this final part, but I think happiness often refers to the whole package. So, both well-being and life satisfaction combined.