Most passenger concerns, including as booking flights, altering and cancelling tickets, advising on flight schedules, aiding with lost and delayed luggage, and dealing with unique situations, such as flying pets or children who are alone, may be resolved by customer service professionals thorugh the Allegiant Airlines Phone Number. Allegiant Air customer care is unable to assist with difficulties beyond the airline's control, such as passport issues or airport facilities, such as lost luggage and security delays. Visit Also: Delta Airlines Phone Number | Aeromexico Airlines Customer Service | American Airlines Customer Service Number | Air Canada Customer Service Number | Spirit Airlines Customer Service | Fly Frontier Customer Service