From Incheon International Airport to Seoul Downtown
Most visitors arrive via Incheon International Airport (IATA: ICN),(), located on Yeongjong Island in the neighboring city of Incheon
A. Express services
Open: 5:00-Midnight; Time: 43 minutes; Cost: ₩8,000
B. all-stop train
Open: 5:00-Midnight; Time: 53 minutes; Cost: ₩4,000
By Airport Limousine
limousine buses are a good option, if you have many package,₩10,000 - 15,000 to/from city for one way. They travel directly to major areas and big hotels in Seoul, while public buses (₩8,000-9,000) will take you to major transit hubs.
A taxi direct to Seoul will cost around ₩60,000-90,000 depending on your destination. You are expected to pay any road tolls on top of the meter fare (usually 6,500 for the main bridge linking to Seoul).
From Gimpo Airport to Seoul Downtown
The closer but older Gimpo Airport  (김포국제공항, GMP) caters only to the shuttle services to Tokyo-Haneda, Osaka-Kansai, Taipei-Songshan, Shanghai-Hongqiao and Beijing, as well as domestic flights within South Korea.
lines 5 and 9. All lines intersect Line 2 which runs in a large circle through Seoul. Line 9 (Gold Line), a private subway line in Seoul, has three express trains per hour.All three lines cost ₩1,000-2,100 (depending on distance)
A taxi to central Seoul will run around ₩30,000. Discounts for subway fare are available with T-Money cards.
Upon arrival, it is worth visiting a convenience store to purchase a T-Money card. This is a rechargeable transport card that can be used on subways, city/local buses, a reasonable number of taxis and can even be used to make purchases at convenience stores. Along with ₩50 discount upon each bus/subway use, it also gives you discount for connecting buses from subway, or vice versa up to 5 times within 30 mins