That's what anyone would expect but it sometimes doesn't apply to airlines. I checked out end of March through mid April CLT-SXM flights (all N/S) ...fares are north of $800 BUT, except for a few Sunday R/T's the Friday and Saturday departures are nearly empty with a couple having less than 10 on board.(one with five)

I would think these prices won't hold. The January N/S are nearly full and go for right around the same price (a tad more) . Also...it is $150-200 cheaper to fly with a connection (PVD-CLT-SXM) in CLT to SXM than just from CLT to SXM...so common sense really doesn't apply to airlines