Downtown luggage checkin for some carriers (Air France, Korean) at the Coex CityAirport Terminal (CALT), Gangnam-gu area. Bus to the airport is 15,000, departing ca. every 20min; takes
90 minutes to go through security. No idea why this airport has the reputation to be one of the best of Asia. Highly inefficient. Get here on time. This is not Singapore...
if the weather is ok and you're doing short-term parking...Go to FAR LEFT Parking Entry Toll Gate. That leads to the OUTSIDE parking lot. Its closer and easier access to the gates +usually more spots