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

Return flights

31 Aug - 07 Sep	Jeju Air
31 Aug - 07 Sep	Jeju Air	direct
30 Aug - 31 Aug	Jeju Air	direct
30 Aug - 05 Sep	Jeju Air	direct
30 Aug - 11 Sep	Jeju Air	direct
31 Aug - 06 Sep	Jeju Air	direct
29 Aug - 01 Sep	Philippine Airlines
28 Aug - 03 Sep	T'way Air	direct
28 Aug - 08 Sep	T'way Air	direct
30 Aug - 04 Sep	Jeju Air	direct
30 Aug - 09 Sep	Jeju Air	direct
28 Aug - 29 Aug	Jeju Air	direct
30 Aug - 30 Aug	Scoot
30 Aug - 30 Aug	Korean Air	direct

Also check the deals for one-way flights from Singapore to Seoul 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 Singapore to Seoul in August from $261

Return flights