Amazing deal: Atlanta to Port-au-Prince, Haiti flight roundtrip as low as $237.
Departures: April – May
Return: April – May
Note, that Spirit airlines is a low-coster, which tend to charge for seat selection (optional) and have luggage fees. Even if you pay for luggage (appr. $30 a leg) it will be cheaper compared to regularly priced tickets of at least $450 for Atlanta.
Also, note that there is a an overnight layover in Miami, which is just a plus to walk around Miami.