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The amount of SKYPASS miles needed for a flight depends on several factors, like the cost of the ticket, the distance, class of the flight and other. What is more, fees may be added to the cost of the ticket. So there is no direct answer if 15,000 miles is enough for your flight. Keep in mind that Korean Air Skypass Visa credit card also comes with $80 annual fee.
If you want to get a travel credit card to earn miles for a flight, consider general travel rewards credit cards. These cards allow to redeem miles with any airline. For example, the comes with great bonus offer - 70,000 bonus miles after you spend $5,000 on purchases in the first 90 days of account opening. Those 70,000 miles are redeemable for $700 in airfare on any airline, anytime with no blackout dates. You will also earn 2x miles on all purchases.
For example, the Discover it® Miles, allows you to earn as many miles as you wish. All miles you've earned your first year will be matched (if you are a new cardmember). For example, if you earn 35,000 miles, you get 70,000 miles. You will earn unlimited 1.5x miles on all purchases.