AirHint found the following cheapest return flights from Chiang Mai (CNX) to Seoul (ICN) in October 2025 (see full year).

Return flights

01 Oct - 12 Oct	Jin Air	direct
01 Oct - 15 Oct	Jin Air	direct
01 Oct - 09 Oct	Jin Air	direct
01 Oct - 11 Oct	Jin Air	direct
02 Oct - 12 Oct	Jin Air	direct
02 Oct - 15 Oct	Jin Air	direct
02 Oct - 09 Oct	Jin Air	direct
02 Oct - 11 Oct	Jin Air	direct
01 Oct - 10 Oct	Jin Air	direct
02 Oct - 10 Oct	Jin Air	direct
29 Oct - 16 Nov	Jin Air
29 Oct - 15 Nov	Jin Air
30 Oct - 16 Nov	Thai AirAsia
27 Oct - 16 Nov	Thai AirAsia
26 Oct - 16 Nov	Thai AirAsia
30 Oct - 15 Nov	Thai AirAsia
27 Oct - 15 Nov	Thai AirAsia
26 Oct - 15 Nov	Thai AirAsia
31 Oct - 16 Nov	Jin Air
29 Oct - 17 Nov	Jin Air

Also check the deals for one-way flights from Chiang Mai to Seoul in October.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Chiang Mai to Seoul in October from $184

Return flights