Online check- in process
Proceed to the Allegiant website: Click on the "CheckIn" page.
Input Your Information: You usually will need your confirmation code or e-ticket number and your last name in order to view your reservation.
Confirm Information: The system will show you your flight information, seat assignments (if you purchased them in advance, or seats will be automatically assigned), and any bags you prepurchased.
Manage Bags (Optional): Your final opportunity to quickly add or change bag reservations prior to flying into the airport. It is normally less expensive to do online than at the airport.
Mobile app check-
Download the App: Download the free Allegiant2Go app through the App Store (for iPhone users) or Google Play Store (for Android users).
Log In or Find Trip: Open the app and log in to your Allegiant account or use the "Find My Trip" feature by inputting your confirmation code/e-ticket number and last name.
Check In: Check in for your flight by following the instructions.
Mobile Boarding Pass: The app will create a digital mobile boarding pass that you may access directly from your phone. This is a paperless and highly convenient feature. You can also check and edit your seat assignments and bag reservations in the app.
What to Do After Online Check-
If you have no bags to check: If you have printed your boarding pass or have a mobile boarding pass and only a personal item or carry-on (which you've already paid for), you can go straight to TSA security at the airport. If you have checked baggage: You will be required to present your checked baggage to the Allegiant Air ticket counter or bag drop point in the airport. Keep in mind that checked baggage should be dropped off a minimum of 1 hour (60 minutes) prior to the scheduled departure of your flight.