Within 24 hours of booking, passengers can use Allegiant Air's name change policy to change the spelling of their names for free. Name changes after this time are subject to a cost and need to be requested at least seven days before departure. Allegiant Air Name Change Policy according to when a request is made, the cost might vary from $75 to $150 per passenger, per segment. Alterations can be made via the Manage Travel area on the Allegiant Air website or by getting in touch with customer support.