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

Return flights

24 Sep - 05 Oct	AirAsia X
21 Sep - 05 Oct	Jeju Air
22 Sep - 05 Oct	Thai AirAsia X
14 Sep - 19 Sep	AirAsia X
24 Sep - 28 Sep	AirAsia X
24 Sep - 25 Sep	AirAsia X
24 Sep - 26 Sep	AirAsia X
21 Sep - 03 Oct	Jeju Air
23 Sep - 05 Oct	Batik Air Malaysia
21 Sep - 01 Oct	Jeju Air
24 Sep - 01 Oct	AirAsia X
21 Sep - 02 Oct	Jeju Air
20 Sep - 02 Oct	Jeju Air
10 Sep - 17 Sep	Eastar Jet
21 Sep - 04 Oct	Jeju Air
17 Sep - 22 Sep	AirAsia X
19 Sep - 26 Sep	Thai AirAsia X
17 Sep - 25 Sep	AirAsia X
17 Sep - 26 Sep	AirAsia X
17 Sep - 28 Sep	AirAsia X

Also check the deals for one-way flights from Seoul to Colombo 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 Seoul to Colombo in September from 303€

Return flights