844-202-7546 Customer Help. Average time to fix: (29 hours) Busiest time: 9:30am. Allegiant Phone Number. 844-202-7546. Set up service. Use GetHuman's issue-specific help: Get targeted tips, help from customers with the same problem, reminders & more. Help with Baggage Problem Help with Refund Flight Help with Change Ticket Info Help with Flight Inquiry