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There are 2 airports in Seoul. Incheon Intl Airport (ICN) is Seoul’s primary airport with at least domestic flights and international flights departing from its runways every week. As of today, airlines operate out of Incheon Intl Airport (ICN). Incheon Intl Airport (ICN) is 8162 miles from Seoul and offers nonstop flights to cities. Seoul’s secondary airport Gimpo Intl Airport (GMP) is 8177 miles from Seoul and has airlines operating out of it and offers nonstop flights to cities with at least domestic flights and international flights departing each week.