If you need a card to earn miles when flying Frontier and other airlines, we cam recommend you a general travel credit card. Travel rewards cards are easy to use – you always know how many miles you need to get a free ticket. You can redeem miles with any airline and earn rewards on all purchases. There is no need to wait for available seats – just buy and redeem miles as a statement credit.
For example, you may like the Discover it® Miles credit card. This card has no annual and no foreign transaction fees and it also has 0% intro APR for 14 months (when the introductory interest rate is over, the ongoing APR will apply). Using this card, you will earn unlimited 1.5 miles on all purchases. All the miles that you’ve earned are matched at the end of the year (provided you are a new cardmember). So if you earn 30,000 miles, you get 60,000 miles. Earned miles can be redeemed for any airline ticket or other travel expenses.