George the flights to DOM from SXM are $250 round trip via SD.com. Now you need to shop sales to SXM and that does go up and down. My ticket there was less than Bonaire so its just bad timing. What are you finding?
However Bonaire is great and as you say an 'easier' flight. Sometimes easy is better!
Yeah, Saint Marten is an overnight but only $700 RT, vs flights to DOM are currently showing up for $1700 RT.