The Feel the Real Caribbean campaign is focusing on four key holiday experiences on the island, from family to luxury, and is running until November 1.
It is running across print, outdoor and digital media including The Times and Smooth FM.
The trade is also being boosted with a £100 voucher ready to be awarded to the person who makes the highest booking to the island during the period.
To enter the competition, anyone making a booking needs to register it on the online training programme saintluciaexpert.com.