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

Return flights

31 Aug - 07 Sep	Korean Air
18 Aug - 31 Aug	Eastar Jet
28 Aug - 02 Sep	Jeju Air
29 Aug - 03 Sep	Jeju Air
26 Aug - 02 Sep	Jeju Air
21 Aug - 02 Sep	Jeju Air
07 Aug - 11 Aug	China Eastern
29 Aug - 02 Sep	Jeju Air
28 Aug - 04 Sep	China Eastern
01 Aug - 01 Sep	Peach
18 Aug - 25 Aug	T'way Air
19 Aug - 27 Aug	T'way Air
20 Aug - 26 Aug	T'way Air
24 Aug - 27 Aug	T'way Air
21 Aug - 26 Aug	T'way Air
21 Aug - 27 Aug	T'way Air
19 Aug - 26 Aug	T'way Air
24 Aug - 26 Aug	T'way Air
30 Aug - 03 Sep	Jeju Air
31 Aug - 03 Sep	T'way 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 261€

Return flights