Thank you for your post !! I transfer it to our team !!
For Grand Case flights, we have about 4-5 round trip a day to St Martin french side airport.
Time table (may change according sunset hour):
SBH > SFG Grand Case
7.30AM, 8.30AM, 4PM, 5PM
SFG > SBH
8AM, 9.30AM, 11.30AM, 4.30PM, 5.30PM
You could find the planning on our website.
Michael