Spirit Airlines offers roundtrip flights to the Caribbean from select cities in the U.S. with prices starting at $158.18, as provided by ShermansTravel. (Click on "Spirit.com" in the main paragraph to see this sale; all taxes are included.) That's the lowest current rate we could find for select routes by $15 and the best price we've seen for fares to the Caribbean from Spirit Airlines. This price is valid on flights departing from Fort Lauderdale, FL, (FLL) to San Juan, Puerto Rico, (SJU) on November 20 with return on December 4. Book this travel deal by November 5 for travel through February 2015. Click here to see more routes.