St. Lucia is one of the most beautiful Caribbean destinations — and also one of the most expensive. So when the opportunity arises to book a ticket for as much as 50% off normal prices, you shouldn’t let it pass you by.This latest deal is for winter travel on American and Delta from New York and Philadelphia — and really, don’t we all wish we could get away to St. Lucia during winter? You can also find discounted fares for travel into the fall. St. Lucia is beautiful year-round, but visiting during the high season from December through April is when the island’s weather is especially dry and sunny.The sale is for American and Delta basic economy tickets, which means you get a carry-on but no seat assignment. Upgrades are available that will let you pick your seat and give you the flexibility to change your travel without penalty.Want your TPG news delivered straight to your inbox each morning? Sign up for our daily newsletter.A tip of the cap to our pals at Thrifty Traveler for alerting us to this great deal, which they sent out to their premium subscribers. The discounted fare site’s premium service is available for $7.99 monthly or $49.99 annually. This membership fee can pay for itself since you’ll get notified about cheap flights, award flight sales and business-class deals.Nonmembers can find sale prices by using Google Flights to search for routes on dates you want to travel.Deal basicsAirlines: American, DeltaRoutes: EWR/JFK/LGA/PHL to St. Lucia (UVF)Cost: From $285Dates: Flights available from February – April and August – DecemberA trip to St. Lucia is a great idea in the middle of the winter. (Photo by Wildroze/Getty Images)We found fares from NYC out of Kennedy Airport (JFK) to St. Lucia (UVF) in March for $285 round-trip on American. As noted above, the sale prices are the more restrictive basic economy ones but you can also upgrade for $80 to a coach fare, which is still a significant savings from normal prices.(Screenshot courtesy of Google Flights)If you can’t wait until March to get away from the frigid temperatures in New York City, fares out of LaGuardia Airport (LGA) to St. Lucia can also be booked for travel in February for $285 on American.Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.(Screenshot courtesy of Google Flights)Let’s cover all our bases in the Tri-State area and show you an absolute steal of a deal if you prefer to fly out of Newark (EWR). You can book a trip from New Jersey to St. Lucia in April for $288 round-trip on Delta. This ticket usually costs over $600, so you’re saving quite a bit of money if your travel schedule aligns.(Screenshot courtesy of Google Flights)The best availability for these sub-$300 fares to St. Lucia was in March. This American itinerary out of Philadelphia (PHL) for early March is an incredible deal that saves you more than 50% off regular prices.(Screenshot courtesy of Google Flights)We also came across Philadelphia-St. Lucia fares in February for $288 round-trip on Delta.(Screenshot courtesy of Google Flights)This fare deal also includes travel from August through December. Below are details on an August flight out of Philadelphia. This round-trip ticket usually costs around $800, but you can book now for just $288.(Screenshot courtesy of Google Flights)Finally, a December fare from NYC (JFK) to St. Lucia on American is only $285 round-trip. That’s an absurd savings of more than $600 for a trip during the best time to visit the island nation.It’s such a good price that even paying the $80 to upgrade to Main Cabin still makes this a fantastic deal.(Screenshot courtesy of Google Flights)Maximize your purchasePay with: The Platinum Card® from American Express for 5x on airfare booked directly with the airline or through American Express Travel (on up to $500,000 per calendar year); the Citi Prestige® Card for 5x on airfare; the Citi Premier® Card (3x on air travel); Chase Sapphire Reserve (3x on air travel); the American Express® Gold Card for 3x on airfare when booked directly with the airline or through Amex Travel or the Chase Sapphire Preferred Card for 2x on travel.The information for the Citi Prestige Card has been collected independently by The Points Guy. The card details on this page have not been reviewed or provided by the card issuer.