AirHint found the following cheapest return flights from Colombo (CMB) to Seoul (ICN) in September 2025 (see full year).

Return flights

21 Sep - 29 Sep	Cathay Pacific
07 Sep - 16 Sep	Cathay Pacific
08 Sep - 16 Sep	Cathay Pacific
18 Sep - 29 Sep	Cathay Pacific
23 Sep - 29 Sep	Cathay Pacific
06 Sep - 14 Sep	Cathay Pacific
07 Sep - 15 Sep	Cathay Pacific
06 Sep - 13 Sep	Cathay Pacific
07 Sep - 14 Sep	Cathay Pacific
05 Sep - 13 Sep	AirAsia
29 Sep - 11 Oct	AirAsia
26 Sep - 11 Oct	AirAsia
29 Sep - 13 Oct	AirAsia
29 Sep - 10 Oct	AirAsia
29 Sep - 16 Oct	AirAsia
23 Sep - 11 Oct	AirAsia
26 Sep - 13 Oct	AirAsia
26 Sep - 10 Oct	AirAsia
26 Sep - 16 Oct	AirAsia
23 Sep - 13 Oct	AirAsia

Also check the deals for one-way flights from Colombo to Seoul in September.

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 Colombo to Seoul in September from $429

Return flights