We booked Denver to SXM round trip for two for $1016 on AA for a 3 week October-November 2016 stay. All taxes and fees included.
We live in Oregon and are using FF miles from Oregon to Denver. The cost of flying United from southern Oregon to Denver was $1500 RT for 2, at the time of booking. Therefore we used FF miles for that segment. Go figure. After working many combinations of flights and airlines, this was our cheapest airfare. As it is, we are overnighting in Charlotte on our way home. We did look at going through SFO, but it was more expensive which is an overnight arriving at midnight at SFO. Then home to Oregon the next day. At least through CLT overnight, we can have a nice dinner, get some sleep, and arrive home at a decent time.
The days of a decent airfare to SXM for many of us, I believe, are gone. You either grin and bear it, or do not go to SXM.

BTW we have been every year since 1997 except for 2000, which was a re-build year after Lenny.