Delta Airlines offers vouchers as a form of compensation when certain irregularities occur with your flight, such as overbookings, cancellations, or missed connections. If you have received a Delta Redeem Voucher Please enter your voucher code during the online booking process or share your voucher code with the agent when booking over the phone. Vouchers can generally be used to purchase Delta tickets and other eligible products and services. Please be sure to read the terms and conditions associated with the voucher, including expiry dates and restrictions, before redeeming the voucher. Review any details on how the voucher can be used, restrictions, fees, etc.