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.
There are 1,760 yards in 1 mile. Likewise, a length of 3 feet is equivalent to 1 yard. One simply multiplies 1,760 by 3 to find the answer of 5,280 feet. If one needs to find miles in inches, then one can multiply 5,280 feet by 12 inches per foot to find the answer of 63,360 inches.