It looks like there is a non-stop from BWI to GCM on June 15th and this web page indicates it is a new seasonal service that was announced last year: https://www.scubaboard.com/community/threads/southwest-adds-nonstop-flights-from-bwi-to-gcm-starting-in-june-2019.570563/ Edited to add this link, it's a quick way to scan the schedule for non-stop flights: https://www.southwest.com/air/flight-schedules/results.html?departureDate=2019-06-15&destinationAirportCode=GCM&originationAirportCode=BWI&scheduleViewType=weekly&timeOfDay=ALL_DAY
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