617 miles
See here :http://maps.google.co.uk/maps?rlz=1C1CHIK_enGB517GB517&um=1&ie=UTF-8&gl=uk&daddr=Destin,+FL,+USA&saddr=Fort+Lauderdale,+FL,+USA&panel=1&f=d&fb=1&dirflg=d&geocode=KfXK-iAnAdmIMb6Ov0B1vgJ2;Kbf0QMl5Q5GIMTJMWEbbi6QX&sa=X&ei=UItVUeLDKIjF0QXv6IGYCA&ved=0CDEQ-A8wAA
This is a Simple Dialog Demo.