To change your flight, you must first visit My Travels on the Allegiant air website, select the flight you want to change, and click "Edit Flight" to complete the process. Select "Start flight change" and select the flight you want to change to search for the next new flight Change fees are waived from the total fare. However, if the fare difference is large, the difference may apply. Now you will eventually have to go through the above procedure to change your flight. So everything discussed above is approximate. Allegiant Air Flight Change Policy, if you need more information, you can call airlines number for a quick response. For allegiant air flight change follow the provided link.