Southwest Airlines offers select 1-way fares to Mexico and the Caribbean with prices starting at $95.80. (Click on "Southwest Airlines" in the top line to see this sale.) That's the lowest rate we could find for select fights by at least $5. This price is valid on flights departing from Baltimore, MD, (BWI) with arrival in Nassau, The Bahamas, (NAS) on August 4. Book this travel deal by April 30 for travel from August 25 through October 28. Click here to see more routes.