While Allegiant's best toll-free number is 1855 568 3576, there are 4 total ways to contact them. According to other Allegiant customers, the next best way to talk to their customer support team is by calling their Corporate Offices department phone number 1855 568 3576. Besides calling, the next preferred option for customers seeking help is for Corporate Offices via 1855 568 3576. Please let us know if you think this information is inaccurate or know of other ways to contact Allegiant so we can share it with other customers. And if you want to compare all the contact information that we collected for Allegiant you can click here.