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

Return flights

01 Sep - 04 Sep	Jin Air
07 Sep - 13 Sep	China Eastern
06 Sep - 09 Sep	China Eastern
07 Sep - 12 Sep	China Eastern
03 Sep - 08 Sep	Jeju Air
11 Sep - 15 Sep	Jeju Air
13 Sep - 22 Sep	Jeju Air
11 Sep - 14 Sep	Jeju Air
24 Sep - 29 Sep	Jeju Air
12 Sep - 15 Sep	Jeju Air
11 Sep - 03 Oct	Jeju Air
01 Sep - 01 Oct	Jeju Air
26 Sep - 01 Oct	Jeju Air
26 Sep - 02 Oct	Jeju Air
26 Sep - 03 Oct	Jeju Air
27 Sep - 01 Oct	Jeju Air
27 Sep - 03 Oct	Jeju Air
01 Sep - 15 Oct	Jeju Air
30 Sep - 02 Oct	Jeju Air
27 Sep - 04 Oct	Jeju Air

Also check the deals for one-way flights from Seoul to Singapore 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 Singapore in September from 235€

Return flights