Before you modify your travel date on American Airlines, make sure you have all of the necessary information. This will help you save money on the trip change. You can learn more about the policy by following the steps below: If your booking qualifies, you can change your flight date within 24 hours of purchasing your ticket. You do not have to pay American airlines change flight fee if you alter your flight within 24 hours of booking because it is entirely free. A flight change cost of up to $200 will be charged by American Airlines, depending on the type of ticket you have. If American Airlines delays or reschedules your flight for any reason, you will be notified. You are free to change your flight date.