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

Return flights

04 Sep - 09 Sep	AirAsia
03 Sep - 13 Sep	AirAsia
07 Sep - 15 Sep	AirAsia
06 Sep - 13 Sep	AirAsia
06 Sep - 09 Sep	AirAsia
14 Sep - 24 Sep	Cathay Pacific
16 Sep - 26 Sep	Cathay Pacific
30 Sep - 13 Oct	Cathay Pacific
23 Sep - 13 Oct	AirAsia
04 Sep - 13 Sep	AirAsia
07 Sep - 13 Sep	AirAsia
07 Sep - 09 Sep	AirAsia
29 Sep - 13 Oct	AirAsia
01 Sep - 01 Oct	AirAsia
23 Sep - 10 Oct	AirAsia
23 Sep - 11 Oct	AirAsia
30 Sep - 15 Oct	AirAsia
30 Sep - 10 Oct	AirAsia
29 Sep - 15 Oct	AirAsia
29 Sep - 10 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 291€

Return flights