From the ultra modern Incheon Airport in Seoul, which was built in part for the 2002 World Cup that Korea co-hosted, getting into the city is a simple matter, with a dedicated rail service supplemented by taxis and buses.
Domestic flights are operated from the Gimpo Airport, which is closer to the city, centre, and serves all the main cities in Korea.
South Korea has a fantastic rail network that connects most of the major cities in the country with fast well priced services that are cheaper than a flying, and do not take much longer.
Driving a hire car in Korea is fraught with the problems of expensive fuel, and traffic jams, but it remains the most flexible way to see the country on an extended tour.