Southwest Airlines offers select 1-way fares to Mexico and the Caribbean with prices starting at $98.60. (Click on "Southwest Airlines" in the top line to see this sale.) That's the lowest rate we could find for select fights by $3. This price is valid on flights departing from Baltimore, WA, (BWI) with arrival in Nassau, Bahamas, (NAS) on November 26. Book this travel deal by November 6 for travel from November 4 through March 6, 2015. Other notable fares: All prices, dates, and booking details were valid at the time of publication.