Question : What day in the next four weeks has the best fares?
Answer : Since low prices are preferred, look at January 1st. As of December 5th, the cheapest ticket sales are coming in 28% below the average price for this route, so you can spend that extra money on an adventure in Seoul.
Question : How long do most people stay in Seoul when they fly in from San Antonio?
Answer : Of course you're not most people, but if you were, you'd stay roughly 14 days.
Question : Will you do what it takes to get the absolute cheapest flight?
Answer : In December, Thursday is your lowest-cost day to fly. Being flexible with your travel days garners you even more savings during your booking.
Question : How often are prices changing for this route?
Answer : Prices for SAT to ICN do change much more than most. Prices tend to be lower the further out you book.