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

Return flights

02 Sep - 07 Sep	AirAsia
15 Sep - 24 Sep	Scoot Tigerair
03 Sep - 07 Sep	Scoot Tigerair
14 Sep - 17 Sep	Scoot Tigerair
08 Sep - 13 Sep	Scoot Tigerair
12 Sep - 19 Sep	Cebu Pacific
15 Sep - 20 Sep	Scoot Tigerair
13 Sep - 17 Sep	Cebu Pacific
13 Sep - 17 Sep	Jeju Air	direct
12 Sep - 19 Sep	Jeju Air	direct
29 Sep - 11 Oct	AirAsia
24 Sep - 11 Oct	AirAsia
24 Sep - 15 Oct	AirAsia
22 Sep - 11 Oct	AirAsia
21 Sep - 11 Oct	AirAsia
24 Sep - 10 Oct	AirAsia
22 Sep - 10 Oct	AirAsia
28 Sep - 16 Oct	AirAsia
29 Sep - 16 Oct	AirAsia
28 Sep - 15 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 179€

Return flights