Visitors must carry valid passports, except USA and Canadian citizens who possess valid return tickets and I.D staying for less than 6 months. Visas are not required where the visitor is a citizen of the USA or a commonwealth country, or where there is an agreement for exemption between the home country and St. Lucia. For further details in the USA, contact the St. Lucia Mission, 800 Second Avenue, 9th Floor New York, NY 10017 and in the UK contact the St. Lucia High Commission 10 Kensington Court, London W8 5DL.
US citizens that need to renew, add pages, change name, or just get a new US passport, can Apply for a New US Passport here.