Korea Train eXpress (KTX) is South Korea’s high-speed rail system that connects the country’s major cities, including Seoul, Busan and Mokpo.
If you are very lucky to arrive Incheon airport at “good times”, you can catch a KTX train to get to Seoul station (KTX trains depart at the airport only 10 times a day, and you may have to wait up to 3 hours for the next train).
Although not the smartest way to leave the airport (unless you’re traveling not to Seoul, but to other South Korean cities), it’s still an affordable and a pretty quick way to reach central Seoul.
Travel time: 45 to 50 minutes
Cost: Standard 12,500 won ($11); standing 10,600 won ($9.34); and first class 17,500 won ($15.42)
Service hours: 06:55 – 20:35 daily
Service schedule: You can check KTX timetable here.