Hawaiian Airlines allows you to cancel your flight online with no problems. Passengers also can request a refund online at Hawaiian Airlines' official website, by filling out the refund request form. Only qualifying Hawaiian Airlines flight tickets that are canceled within the present time-frame are eligible for a refund. Hawaiian Airlines Cancellation Policy doesn't offer refunds after a ticket's validity period has expired. https://reservationsnumber.org/flight-cancellation/hawaiian-airlines-cancellation-policy/