I am with manpot. The 11:30 will leave about 11:45. You will hit the dock 12:30 to 12:45. You may or may not need to wait to dock depending on traffic. If you get right in they won’t open customs until all the bags are unloaded. Probably a average of 30 minutes to clear customs. 15 more minutes to the airport. It’s now 1:15 to 1:30 as you pull up to the airport. Most airlines shut off checked bags 90 minutes prior at STT. You are not going to make it even if you pay the established bribe to go to the head of the line. If you have no checked bags and check in online you will probably make it assuming everything goes ok. Rarely does everything go OK. Arriving at the STT airport after 12 noon is a soul killing experience!