I think their fares are higher, but since they don't charge for the first 2 bags, then you have to consider that. Many times that would make the price on par with other airlines. My issues is that until they drop the Wright Amendment, SW can not fly interstate from Dallas without stopping in a neighboring state, making all flights at least 1 stop. If I am going to pay the same price, I will take the more convenient non stop flight. However, I don't know if the San Juan flight falls under the same rules or not.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007