Spirit Airlines offers roundtrip flights to Puerto Rico from select cities in the U.S. with prices starting at $151.18, as provided by ShermansTravel. That's the lowest current rate we could find for select routes to Puerto Rico by $10. This price is valid on flights departing from Fort Lauderdale, FL, (FLL) to San Juan, Puerto Rico, (SJU) on August 19 with return on September 10; prices vary depending on the departure cities and dates chosen. Book this travel deal by August 5 for travel August 1 through September 30. Click here to see more routes.