AirHint found the following cheapest return flights from Seoul (ICN) to Singapore (SIN) in September 2026 (see full year).

Return flights

30 Sep - 05 Oct	AirAsia X
05 Sep - 09 Sep	AirAsia X
01 Sep - 04 Sep	Vietnam Airlines
02 Sep - 04 Sep	Scoot
01 Sep - 05 Sep	Scoot
08 Sep - 15 Sep	Cebu Pacific
05 Sep - 09 Sep	Scoot	direct
15 Sep - 20 Sep	Cebu Pacific
08 Sep - 16 Sep	Cebu Pacific
08 Sep - 15 Sep	Korean Air	direct
08 Sep - 16 Sep	Korean Air	direct
03 Sep - 01 Oct	Korean Air	direct
29 Sep - 02 Oct	Cebu Pacific
29 Sep - 02 Oct	Korean Air	direct
30 Sep - 05 Oct	Scoot	direct

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 149€

Return flights