Being the largest and busiest airport in South Korea, Incheon International Airport is home to some of the major domestic airlines and plenty of other large international carriers. Korean Air uses Incheon International Airport as a major hub. South Korea's national airline connects the Seoul and Incheon metropolitan areas with some of the largest cities in multiple continents. Korean Air operates direct flights to major Asian cities including Bangkok, Ho Chi Minh City, Jakarta, Kuala Lumpur, Manila, Singapore, Taipei, and Tokyo. South Korea's national airlines also serves some of the largest cities in China including Beijing, Hong Kong, Gunagzhou, Shenzhen, Shanghai and Wuhan.
Passengers at Incheon International Airport can also use Korean Air to get to major destinations in the Middle East and India. Bali and Mumbai are major Indian cities that are accessible through South Korea's largest airline. Saudi Arabia and the United Arab Emirates are some of the major destinations within the Arab World that are accessible via Korean Air.
South Korea's national airline is also one of the few companies to offer direct flights between Seoul-Incheon region and the American continents. Destinations in Brazil, the United States, and Canada are on the list of Korean Air flights to the Americas. Korean Air also offers limited direct service to Australia, Europe, and Russia. All Korean Air service is available in the Main Concourse of the terminal building at Incheon International Airport.
Asiana Airlines takes the role of being the second busiest airline at Incheon International Airport. This major South Korean airline company connects South Korea's largest airport with more than 40 total destinations within Asia, Europe, the Middle East, Pacific region, and American continents. In fact, Asiana Airlines operates a similar schedule to that of Korean Air. The diverse Asiana Airlines schedule includes flights to capital cities like Bangkok, Beijing, Istanbul, London, Paris, and Tokyo. Asiana Airlines is based in the Main Concourse at Incheon International Airport.
Other domestic carriers that serve Incheon International Airport include Jin Air and Jeju Air. Both South Korean airlines offer flights to Asian destinations such as Bangkok, Cebu, Hong Kong, and Osaka.
Some of the major Asian airlines serving Incheon International Airport include Air China, Cathay Pacific, China Eastern Airlines, China Airlines, All Nippon Airways, Malaysia Airlines, and Thai Airways International. Large European carriers that operate in South Korea's busiest airport are Air France, British Airways, KLM, Lufthansa, and Turkish Airlines. All international airlines use Concourse A at Incheon International Airport.