The free cancellation service offered by United Airlines is only available for cancellations made prior to 24 hours after booking. The airline's penalty determines the cancellation request. The United Airlines cancellation fee may vary according to the excursion type, lodging class, and applicable passage restriction. Economic appointments are non-transferable and non-returnable after 24 hours of purchase. Other than that, the airline charges a cancellation fee as no exception to be provided unless otherwise specified.