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To change your Allegiant flight online:
Go to AllegiantAir.com
Select the Manage trips option
You will be offered 3 options to change your flight:
By validation #
By email
By credit card
Provide the information for the chosen option
Select your flight and follow the instructions to change it
You can also change your Allegiant flight reservation using the mobile app. If you are having difficulty, contact the Allegiant Customer Relations team for assistance.
Check Also: Change Your United Flight Reservation | Change Your Southwest Flight Reservation