Frontier Airlines accepts major credit and debit cards including Visa, Mastercard, American Express, and Discover for bookings. Digital wallets like Apple Pay and Google Pay are also supported on the website and app. Vouchers, flight credits, and eCredits from previous cancellations can be applied during payment. Cash is accepted at select airport ticket counters only. For clarification on using specific payment methods or resolving issues, call (844)734-0813. Note that all tickets are non-refundable unless canceled within 24 hours of booking for flights 7+ days out, or if Refundability is purchased. International bookings may have additional requirements.