Allegiant Airlines have an online option to do check-in, where a passenger can visit the airline's website and do check-in. On the other hand, you can call Allegiant Airlines Phone Number to do check-in over the phone call. See the steps below to do check-in with Allegiant Airlines:
1. Visit the Allegiant Airlines website and select manage your booking option.
2. Provide your flight number, last name or departing city airport.
3. Select the flight on which you want to check-in from the list.
4. Select your seats and add the baggage if required.
5. Pay the extra amount for preferred seats or extra baggage.
6. Follow the steps to complete your flight check-in process.
7. Receive the boarding pass on the email address or print it.

1. Dial Allegiant Airlines contact number and connect with the customer care expert.
2. Provide your first name, last name, flight confirmation number and departing city airport.
3. Let the customer care expert collect all the information about your flight and confirm it before the check-in process.
4. Ask the expert to select your preferred seats and provide your baggage information to add it online.
5. Confirm the extra charges for seat selection or extra luggage and pay it to proceed with check-in.
6. Receive your boarding pass on your email or request the agent to send e-boarding pass at your mobile number.
7. Get the print of your boarding pass or save the e-boarding pass in your mobile device to show it at the airport.
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Check-in through website:
1. Visit the Allegiant Airlines website and select manage your booking option.
2. Provide your flight number, last name or departing city airport.
3. Select the flight on which you want to check-in from the list.
4. Select your seats and add the baggage if required.
5. Pay the extra amount for preferred seats or extra baggage.
6. Follow the steps to complete your flight check-in process.
7. Receive the boarding pass on the email address or print it.

Check-in by calling airlines toll-free number:
1. Dial Allegiant Airlines contact number and connect with the customer care expert.
2. Provide your first name, last name, flight confirmation number and departing city airport.
3. Let the customer care expert collect all the information about your flight and confirm it before the check-in process.
4. Ask the expert to select your preferred seats and provide your baggage information to add it online.
5. Confirm the extra charges for seat selection or extra luggage and pay it to proceed with check-in.
6. Receive your boarding pass on your email or request the agent to send e-boarding pass at your mobile number.
7. Get the print of your boarding pass or save the e-boarding pass in your mobile device to show it at the airport.
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