Are you unsure about the deadline for changing your United Airlines flight in order to receive a refund? The United Airlines refund policy may be used in several situations. The regulations apply to both refundable and non-refundable tickets, regardless of the tariff type or the preferred carrier. After 24 hours from the time of purchase, there is no longer a cancellation fee. If you cancel more than 7 days prior to the departure date, you are eligible for a full refund under the terms of this policy.