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	AirAsia
14 Sep - 21 Sep	AirAsia
03 Sep - 10 Sep	Cathay Pacific
05 Sep - 12 Sep	Cathay Pacific
09 Sep - 15 Sep	Cathay Pacific
11 Sep - 17 Sep	Cathay Pacific
02 Sep - 09 Sep	Cathay Pacific
20 Sep - 28 Sep	AirAsia
29 Sep - 10 Oct	AirAsia
28 Sep - 10 Oct	AirAsia
21 Sep - 10 Oct	AirAsia
24 Sep - 10 Oct	AirAsia
22 Sep - 10 Oct	AirAsia
20 Sep - 10 Oct	AirAsia
19 Sep - 10 Oct	AirAsia
29 Sep - 15 Oct	AirAsia
28 Sep - 15 Oct	AirAsia
24 Sep - 15 Oct	AirAsia
15 Sep - 20 Sep	Cathay Pacific
05 Sep - 17 Sep	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 341€

Return flights