Incheon International Airport near the country's capital Seoul is the most likely entry point for visitors to South Korea. There are direct flights available from London to Seoul with Korean Air and many other airlines offering routes with a transit. What's more, there are plenty of Student/Youth flight options available too! Once in South Korea it's fairly easy to get around. The South Korea Rail Pass is a great choice, and there are also a good selection of domestic flights available as well as ferries out to the country's islands.