What is the rule for canceling a Wizz air flight within 24 hours? To answer this question according to the rules, Wizz air cancel flight within 24 hours approach provides at least one day of transit time to all passengers. Travelers may cancel or reschedule their flight for free within 24 hours of booking, provided, the scheduled departure date is at least 7 days from then. When traveling by airplane, this is one of the significant policies passengers relish knowing. This policy is made to provide convenience and luxury for travelers who because for any reason urgently need to cancel their flights or are unsure about where and when they’re willing to go.