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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.