Getting a full refund from Hawaiian Airlines depends on the circumstances of your cancellation. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) Here's a breakdown of the airline's refund policy: 

You will receive a full refund if

• You cancel within 24 hours of booking: You can get a full refund for any fare, including Main Cabin Basic, as long as you purchased your ticket at least seven days before the flight's departure. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) 
• Hawaiian Airlines cancels your flight: If the airline cancels your flight for any reason, you are entitled to a full refund to your original form of payment, even for non-refundable tickets.
• Hawaiian Airlines significantly delays or changes your flight: You are entitled to a full refund if the airline makes a significant schedule change and you choose not to accept the new flight arrangements. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) 
• You purchased a "Refundable" fare: If you originally bought a refundable ticket, you can receive a full refund at any time before the flight departs.