Hawaiian Airlines has a one day seat sale going on right now where you can book flights between the mainland U.S. and the Hawaiian Islands for as little as $81 one way. The $81 flights are good between the four California cities they serve and Honolulu or Maui. The fare is good for travel between September 15 and November 3 and must be booked on June 16. Please note that at the time of posting this the Hawaiian Airlines website was having some issues due to the high traffic for this sale! Be patient and keep trying to book to get in on the deal.