I don't think any of them really have "cheap airfare" but the islands I have been checking that offer good deals are Puerto Rico and Jamaica. Maybe others here can give you a better answer.
Isla Margarita
Puerto Rico is the name of the Caribbean island you visit on your fourth stop.
no Nicaragua is not a Caribbean island the only island that is an Caribbean island in central America is Belize
The nation with the largest island in the Caribbean Sea is what island Cuba.
Yes it is a country island in the Caribbean Sea.
"St. Croix (kroy) is the largest and most industrialized island in the Caribbean."
Margarita Island
Puerto Rico is the name of the Caribbean island you visit on your fourth stop.
Probably the Bahamas.
A small island in the Caribbean that you could visit while one vacation is Tobago. It offers beautiful beaches, along with a beautiful view of the ocean.
The Bahamas are probably the cheapest because it is the most visited country. The Dominican Republic is also inexpensive. Airfare to St. Croix was certainly more expensive for me.
no Nicaragua is not a Caribbean island the only island that is an Caribbean island in central America is Belize
A travel agent will be able to assist in renting a private island in the Caribbean. Visit the websites IslandHideAways and PrivateIslandsOnline for some suggestions.
Jamaica IS an island in the Caribbean Sea.
The nation with the largest island in the Caribbean Sea is what island Cuba.
Royal Caribbean is a great cruise line to use for your Caribbean vacation. There are others that do visit the Caribbean but Royal Caribbean is an excellent way to visit.
Yes it is a country island in the Caribbean Sea.
The Nature Island of the Caribbean.