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

Return flights

01 Sep - 03 Sep	T'way Air	direct
09 Sep - 11 Sep	T'way Air	direct
09 Sep - 23 Sep	T'way Air
01 Sep - 06 Sep	T'way Air	direct
16 Sep - 18 Sep	T'way Air	direct
16 Sep - 23 Sep	T'way Air	direct
02 Sep - 16 Oct	T'way Air
15 Sep - 26 Sep	T'way Air
09 Sep - 12 Sep	T'way Air	direct
01 Sep - 13 Oct	Scoot
15 Sep - 18 Sep	T'way Air	direct
03 Sep - 05 Sep	T'way Air	direct
23 Sep - 28 Oct	AirAsia
01 Sep - 13 Oct	Scoot	direct
01 Sep - 12 Oct	Scoot
28 Sep - 08 Oct	AirAsia
28 Sep - 16 Oct	AirAsia
28 Sep - 11 Oct	AirAsia
29 Sep - 16 Oct	AirAsia
29 Sep - 08 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 186€

Return flights