Puerto Rico is the hub of the Caribbean with over 700 domestic and international flights per week from the U.S., Caribbean, Latin America, and Europe. You can literally get here from almost anywhere. And, as a U.S. Commonwealth, no passports or visas are required for U.S. visitors; foreign nationals should have valid passports and visas as required.
Air access to Puerto Rico weekly by non-stop and direct flights as of October 2009: