Call 1-833-246- 4435 to speak directly with a live Allegiant Airlines customer service Agent for flight reservations, ticket changes and, cancellations quick Air Lines support. At Allegiant Airlines , we're committed to providing fast and hassle-free assistance with: Flight Reservations (domestic & international) Ticket Changes and Same-Day Flight Modifications Flight Cancellations and Refund Guidance Name Corrections on Tickets Seat Selection and Upgrades Easy date/time changes for existing tickets Personalized Customer Service Support Whether you're booking a new trip, adjusting an existing itinerary, or seeking help with your travel preferences, our trained team is