Seoul's Incheon International is one of Asia's busiest connecting hubs, with nonstop service from many North American cities. That makes South Korea both a destination in its own right and a convenient stopover on the way to the rest of Asia.
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Korean Air is the flag carrier (Asiana Airlines is being merged into it), and major US airlines and their alliance partners also serve Seoul from North America.
Winter (outside the holidays) and late spring before the summer peak can bring lower fares. Lunar New Year and Chuseok (the autumn harvest holiday) are busy, expensive times to fly.
Most international flights, including all long-haul flights from North America, use Incheon International. Gimpo is closer to the city and mainly handles domestic and some short regional routes.
Yes. Incheon is a major transfer hub with flights across Asia, and a stopover of a day or two lets you see Seoul on the way to another destination.
Around Lunar New Year and Chuseok, when many Koreans travel, and in the summer holiday period. Spring and autumn are popular for weather, so book those seasons early.
