Southwest is holding a sale, flights start at $45. Things to know:
Book by 7/5. Nonrefundable. Seats, travel days, and markets limited. Blackout dates apply. Domestic travel valid 8/21/18 – 12/19/18. Travel to/from San Juan, Puerto Rico valid 9/5/18 – 12/6/18. International travel valid 8/21/18 – 12/12/18. Points bookings do not include government fees from $5.60 per one-way flight.
United has round trip flights to Hawaii from the east coast from $325. Seems to be out of Houston (IAH), Newark (EWR) and San Francisco (SFO) and into Kona, HI (KOA) \ from September until December 2018.