A short guide on Allegiant Airlines check-in and boarding process. Learn how and when to check in for your flight—online, with the mobile app, or at the airport counter. The check-in period begins 24 hours before departure and ends 45 minutes before the planned departure time. You can either Allegiant Airlines check in online and print your paper boarding passes to bring to the airport, or you can retrieve your boarding pass(es) digitally via the Allegiant mobile app (preferred).
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