Fly from nonstop from Washington DC-National to Nassau, Bahamas for $290 roundtrip on JetBlue.
This discount deal to this sandy Atlantic archipelago is available on Saturdays starting in early December through the middle of January, with returns available in February.
Searching on the JetBlue site, I found seats departing DCA on Saturday, January 5, and returning from NAS on Saturday, January 12, 2019. If JetBlue's schedule is too stringent for you, then purchase a one-way fare for $89 and pair it together with a separate one-way ticket from another airline. American Airlines is offering a similar price on this route, but those itineraries will require a connection.
If you've got another exotic destination in mind to escape the winter blues, here's a list of all our Best Beach destination deals to islands and cities across the globe.
Need a room in Nassau? Here's what's available for the mentioned dates on Hotelwatchdog.