You should consider travel credit cards to earn miles or points and redeem them with any airline you want, including Volaris. For example, the Discover it® Miles credit card will allow you to earn 1.5x miles on all purchases. What is more, Discover will match all the miles you’ve earned at the end of your first year (if you are a new cardmember). For example, if you earn 35,000 miles, you get 70,000 miles. This card comes with no annual fee and no foreign transaction fee.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.