To change the date on a Hawaiian Airlines ticket, call 1-808-865-4414 or log into your account on their website. Go to “My Trips,” select your booking, and choose “Change Flight.” Most fare types, excluding Basic Economy, allow date changes without a change fee, although you may need to pay a fare difference. If your new flight is cheaper, you might receive a travel credit. Date changes must be made before the original departure time, and same-day changes may be available for a fee. Check fare rules to understand applicable conditions before confirming.