Flights Chiang Mai → Seoul (CNX-ICN) — THB Fares, Airlines, Frequency

Chiang Mai to Seoul links northern Thailand with the South Korean capital, with around seven flights a week. The route carries South Korean travellers heading for Chiang Mai’s temples, mountains and cooler climate, balanced by Thai travellers bound for Seoul. Block time is about six hours, an easy overnight or daytime sector.

Airlines on this route

Two carriers fly CNX-ICN: Korean Air and Thai Airways, both full-service. Each includes a checked baggage allowance and meals, and both serve Incheon, Seoul’s main international gateway, directly. With two established carriers on the route, the choice comes down to schedule and price rather than product differences.

THB fares

Fares on CNX-ICN follow the Korean holiday calendar. The Korean winter break, Lunar New Year and summer holidays are the busiest and most expensive, with seats selling early — two to three months of lead time suits those dates. For quieter weeks, five to eight weeks ahead usually secures a reasonable economy fare in THB.

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About Seoul

Seoul is South Korea’s capital — a modern, fast-moving city of high-rise districts, royal palaces and a deep food and shopping culture, from Myeongdong’s markets to the old lanes of Bukchon. For Thai travellers arriving from Chiang Mai it is a contrast in pace and scale, and Incheon connects onward across Korea and the wider region.

FAQ

Which airlines fly Chiang Mai to Seoul? Direct CNX-ICN flights are operated by Korean Air, Thai Airways. Compare baggage allowance, fares and schedules in the carrier table above.

How long is the CNX-ICN flight and how often does it run? Block time is about 6.0 hours. The CNX-ICN route runs roughly 7 flights per week across all carriers.

How far ahead should I book CNX-ICN for the best fare? Booking 4-8 weeks ahead for regular dates, and 10-14 weeks for peak periods (Songkran, New Year, Hajj/Umrah season), typically saves 15-30%. See the month-by-month fare heatmap above.

What is the checked baggage allowance on CNX-ICN? It varies by carrier and fare class — full-service carriers on this route usually include 20-30 kg, while low-cost carriers sell it as an add-on. Confirm the current policy on the airline’s site before booking.

What currency is used in Seoul? Seoul uses USD. Compare airfares in THB and budget on-the-ground spending in USD.

Related routes

• CNX airport
• ICN airport