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

Return flights

29 Aug - 09 Sep	AirAsia X
25 Aug - 02 Sep	Thai AirAsia X
27 Aug - 07 Sep	AirAsia X
27 Aug - 31 Aug	AirAsia X
20 Aug - 06 Sep	AirAsia X
20 Aug - 04 Sep	AirAsia X
20 Aug - 07 Sep	AirAsia X
20 Aug - 09 Sep	AirAsia X
20 Aug - 28 Aug	AirAsia X
20 Aug - 31 Aug	AirAsia X
20 Aug - 05 Sep	AirAsia X
20 Aug - 03 Sep	AirAsia X
20 Aug - 26 Aug	AirAsia X
20 Aug - 25 Aug	AirAsia X
20 Aug - 01 Sep	AirAsia X
20 Aug - 27 Aug	AirAsia X
20 Aug - 21 Aug	AirAsia X
20 Aug - 24 Aug	AirAsia X
29 Aug - 31 Aug	AirAsia X
30 Aug - 31 Aug	AirAsia X

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

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 August from 290€

Return flights