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

Return flights

03 Sep - 23 Sep	AirAsia
27 Sep - 13 Oct	Cathay Pacific
05 Sep - 23 Sep	AirAsia
09 Sep - 23 Sep	AirAsia
07 Sep - 23 Sep	AirAsia
02 Sep - 23 Sep	AirAsia
16 Sep - 23 Sep	AirAsia
18 Sep - 23 Sep	AirAsia
20 Sep - 23 Sep	AirAsia
15 Sep - 23 Sep	AirAsia
19 Sep - 23 Sep	AirAsia
26 Sep - 17 Oct	AirAsia
28 Sep - 17 Oct	AirAsia
30 Sep - 17 Oct	AirAsia
27 Sep - 17 Oct	AirAsia
29 Sep - 17 Oct	AirAsia
30 Sep - 20 Oct	AirAsia
29 Sep - 20 Oct	AirAsia
26 Sep - 07 Oct	AirAsia
30 Sep - 21 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 373€

Return flights