Cheap is a relative word when talking about the Bahamas. That being said, it's my experience that the least expensive airfares, are available by flying into Nassau. More flights, and more carriers servicing Nassau.
The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959.
A mile is a unit of length most commonly equivalent to 5,280 feet. The mile of 5,280 feet is sometimes called the statute mile or land mile to distinguish it from the nautical mile.