South Korea Rock Climbing

Flights

Korea has two international airports on the peninsula, Incheon (ICN) and Busan (PUS), with one on the island of Jeju (CJU).  

Inter-country flights are frequent and cheap, albeit not the friendliest environmentally. The main one to fly out of Seoul is Gimpo airport. 

There are also:

Yangyang airport in the northeast (next to Seoraksan NP, in Sokcho)

Chungju Airport (near Daejeon and Daedunsan NP)

Ulsan Airport next to Ulsan - near (Munsusan and the Yeongnam Alps)

Daegu Airport

Gwangju airport (near Yongseo falls)

And more. click here for a list.

Trains

The KTX/SRT is Korea's version of the bullet train. The train runs on time and is very comfortable and efficient. 

SRT site

KTX site

You can usually buy tickets at the station on weekdays, but on weekends outside of very early or very late, it will be difficult. 

Driving

Roads in Korea are well maintained and easy to drive on. There are a lot of tolls and tunnels - from Seoul to Busan you will end up paying about $20 total in tolls. Renting a compact car will offer you 50% off on tolls/parking in any metered parking lots. 

Buses/Subway

Google map works in Korea, but Naver Maps or Kakao maps work MUCH better. You may have some difficulty with the locations as the romanizations of the Korean language is not standardized and is inconsistent. If you learn a bit of Korean, that would help a lot. The apps update with real-time bus arrival approximations. In the major cities, I would say they are very accurate. When you get further out into the countryside, the buses are much less frequent and inconsistent. 

Pick up a bus/subway/transit card for about 3 dollars at any convenient store. You can charge/recharge at any convenient store (need cash to do so) or any subway station. Each ride is from 1-2 dollars depending on how many transfers you take. The best part is the transit card works for ANY subway/public transit in the entire country, even airport buses/subways (not the express train, however). The transit card does NOT work for KTX/SRT trains.

Taxis

Koreans use the app kakaotaxi to hail taxis. The app has an English version and a "pay by card/cash" option so you don't have to be a Korean citizen to use it. Conveniently, you can also tap your transit card if you have enough money on there to pay for your taxis. Of course, you can always hail taxis in person. The taxis will light up in RED and say "빈차" (empty car) if they are available and drive in the closest right lane if they are available. If a taxi has a red sign and is in the left lane, chances are they will drive past you.