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

Return flights

01 Sep - 06 Sep	T'way Air	direct
01 Sep - 05 Sep	Jeju Air	direct
15 Sep - 18 Sep	Jeju Air	direct
15 Sep - 19 Sep	Jeju Air	direct
01 Sep - 08 Sep	T'way Air	direct
09 Sep - 23 Sep	T'way Air	direct
03 Sep - 08 Sep	Jeju Air	direct
04 Sep - 09 Sep	Jeju Air	direct
18 Sep - 25 Sep	Jeju Air	direct
04 Sep - 10 Sep	Jeju Air	direct
24 Sep - 08 Oct	AirAsia
23 Sep - 08 Oct	AirAsia
17 Sep - 08 Oct	AirAsia
24 Sep - 14 Oct	AirAsia
23 Sep - 14 Oct	AirAsia
22 Sep - 08 Oct	AirAsia
24 Sep - 09 Oct	AirAsia
23 Sep - 09 Oct	AirAsia
26 Sep - 08 Oct	AirAsia
26 Sep - 14 Oct	AirAsia

Also check the deals for one-way flights from Singapore to Seoul 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 Singapore to Seoul in September from $214

Return flights