Expedia provides a 24-hour cancellation policy. If you want to cancel your flight you are able to do so free of charge within 24 hours of the date of your reservation. To make cancellations easier, they are possible via their website or by calling their customer support line at toll free number +1-877-652-2714. https://www.crmportalconnector.com/developer-network/forums/general-discussions/does-expedia-give-full-refund-for-24-hour-cancellation