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

Return flights

26 Aug - 02 Sep	Jeju Air
28 Aug - 02 Sep	Jeju Air
27 Aug - 08 Sep	Jeju Air
25 Aug - 01 Sep	Jeju Air
28 Aug - 03 Sep	Jeju Air
22 Aug - 24 Aug	China Eastern
26 Aug - 01 Sep	Jeju Air
27 Aug - 01 Sep	Jeju Air
28 Aug - 01 Sep	Jeju Air
28 Aug - 04 Sep	Jeju Air
19 Aug - 26 Aug	Jeju Air
25 Aug - 29 Aug	Jeju Air
27 Aug - 29 Aug	Jeju Air
26 Aug - 29 Aug	Jeju Air
20 Aug - 26 Aug	Jeju Air
29 Aug - 02 Sep	Jeju Air
24 Aug - 26 Aug	Jeju Air
21 Aug - 26 Aug	Jeju Air
28 Aug - 30 Aug	Jeju Air
22 Aug - 26 Aug	Jeju Air

Also check the deals for one-way flights from Seoul to Singapore 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 Singapore in August from $328

Return flights