The Incheon International Airport of Seoul is South Korea's largest and busiest airport with close to 40 million passengers a year. The Incheon Airport is also one of the best airports in the world according to SkyTrax; it has been voted in the top three since 2009.
The airport has its own casino, ice skating ring, hotels, museum and golf course, so long transfer times is not a real problem anymore.
Most flights from Incheon International Airport are to Manila and to Singapore but there are many more flights to other destinations as well, most of them by Korean Air. These are the most popular destinations from Incheon International Airport:
Manila (MNL)
Singapore (SIN)
Shanghai (SHAA)
Jakarta (JKTA)
New York (NYCA)
Istanbul (ISTA)
Sydney (SYD)Denpasar Bali (DPS)
Kuala Lumpur (XKLA)Shanghai (SHAA)Kalibo (KLO)
Bangkok (BKKA)
Tokyo (TYOA)
Hong Kong (HKG)
