Question : If your plans are flexible, have you considered changing your departure day?
Answer : The cheapest day to fly in August is Wednesday. Being flexible with your travel days garners even more savings during booking.
Question : What is the cheapest day to fly in the next four weeks?
Answer : Since low prices are preferred, look at Aug 9th. As of Jul 17th, it's showing the cheapest ticket sales at $1,411. That is 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?
Answer : Of course you're not most people, but if you were, you'd stay roughly 20 days.
Question : How much should a trip from Springfield (SGF) to Seoul (ICN) cost?
Answer : Flight prices fluctuate a lot less than most routes from the United States for SGF to ICN. They range from $1,251 to $1,436. Remember, you can save by booking further in advance.