Ft. Lauderdale is a city that stretches several miles, and Haiti is a whole country, that's many miles wide and many miles high.
In order to nail down a reliable answer, you'd really need to specify one point in Ft. Lauderdale and one point in Haiti.
If you start at the northwest end of Runway-13 at Ft. Lauderdale Executive Airport, and take the shortest possible route to the east end of Runway-28 at the Aeroport International de Port au Prince at Haiti's capital city, you'd have to travel 727.57 miles.
But if you start in Ft. Lauderdale at the intersection of Griffin Rd and Ravenswood Rd, and take the shortest possible route to the Dispensaire de Bord-de-Mer hospital on Haiti's north coast, you'd only have to travel 613.63 miles.
You really need to say WHERE in Ft. Lauderdale and WHERE in Haiti.
