A credit card with miles rewards that is issued by a major bank can be a good option for you. Miles rewards cards often come without annual fees, or fees are waived for the first year. Miles rewards cards are cheaper because they do not offer such benefits you might not use like priority boarding, lounge access, or first checked bag free. Miles rewards credit cards will allow you to earn miles on all your everyday purchases. Miles do not expire and there are no caps on how many of them you can earn. Earned miles can be redeemed for flights with any airline, including for Korean Air airfare.