Major credit cards are accepted on the island, especially at larger establishments such as resorts and restaurants, but smaller local businesses and street vendors will require payment in cash.

Credit cards are widely accepted throughout St. Lucia, particularly in the major tourist hubs like Rodney Bay, Castries, and Soufrière. Most hotels, upscale restaurants, car rental agencies, and larger supermarkets accept Visa and Mastercard without issue; American Express is accepted but less commonly found in smaller establishments. However, St. Lucia still has a significant "cash economy" for local experiences. If you plan to visit the local "Friday Night Fish Fry" in Anse La Raye, buy fruit from a roadside vendor, or tip your tour guide, you will absolutely need cash. The local currency is the Eastern Caribbean Dollar (XCD), which is pegged to the U.S. Dollar at a rate of roughly 2.7 to 1. While many vendors will accept U.S. Dollars, they will often give you change in XCD and may use a less favorable exchange rate. For the best experience, use a credit card with no foreign transaction fees for your major purchases and keep a small amount of local cash for the authentic island "mom-and-pop" stops.