When is seasonally a good time to find cheap(er) tickets from Los Angeles to Bora Bora return?
Or is it always super expensive?
You can sometimes find better deals during the winter months (Dec through Feb with the obvious exception of Christmas - New Years period), as that is rainy season for French Polynesia. But these tend to be more hotel deals than airfare deals. There are only a couple of airlines with limited flights from the USA to FP, so not much competition to produce lower fares.