Allegiant Check In, passengers can also check in at the airport ticket counter or self-service kiosk. Allegiant Air’s friendly staff members are available to assist with any check-in inquiries or concerns you may have. Whether you’re dealing with check-in problems or If you have any issues or questions during your travel, don’t hesitate to reach out to Allegiant Air’s Toll-free number at +1-844-499-2038.