If you fly out of Orlando (MCO), you do have two other options other than AA or Spirit. Delta has a flight that goes from MCO to Atlanta and then non-stop to St. Croix for $520 pp. This is Delta's main cabin fare which lets you choose your seat. Frontier has a non-stop flight from MCO to St. Croix for $295 pp. This is their premium bundle fare with extra legroom and no change fees. These fares are for travel departing on August 3 and returning on August 10.