For most domestic flights to Hawaii, airfare follows a "Goldilocks" window where prices are most stable before a sharp increase in the final 21 days. Aim for 21 to 121 days before departure.
For Thanksgiving, the sweet spot is 24–59 days out; for Christmas, aim for 32–73 days before departure. Cheapest Months and Days to Fly when is the best time to buy airfare to hawaii
Book 4 to 6 months or more in advance.