Several airlines have an air fare sale with cheap flights to Hawaii. If you travel between December and May 2018 you can get cheap flights to Honolulu Hawaii from $442 round trip. Check out the details of this air fare sale to Hawaii.
Southwest Airlines has announced that it will begin to fly to Hawaii in the future. At this time it is not known when exactly the Southwest Airlines flights to Hawaii will begin. The airline must obtain FAA approval for extended over-water operations, and it is uncertain when that will be accomplished.