Allegiant offers a variety of payment options to accommodate different customer preferences. Customers can typically pay for their flights and services using major credit and debit cards, including Visa, MasterCard, American Express, and Discover. Additionally, Allegiant may accept payment through alternative methods such as prepaid cards, provided they are affiliated with the major card networks. Customers should note that Allegiant does not accept cash or checks for online purchases. When booking online, it is essential to enter the payment information accurately to ensure a smooth transaction. For the most updated information regarding accepted payment methods, customers are encouraged to visit Allegiant's official website, where they can also find any potential changes or specific policies related to payment processing.