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.
One of the oldest known units of distance and length used in the US and the Imperial systems, a mile is equal to 1,760 yards or 5,280 feet. In contrast to inches or yards, miles can be considered the most internationally recognized and used unit of distance.