Knowing how to change a flight date for free can help you save money when your travel plans change unexpectedly. Many airlines allow free date changes on flexible fares, while others may only require you to pay any difference in ticket price. Look for information about flight changes, cancellation policies, and whether your fare includes free date changes. Log in using your booking reference, select your reservation, and check whether you can change your travel date without paying a change fee. Check the new travel date, departure time, destination, and any additional charges before saving the confirmation.