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

Return flights

14 Oct - 16 Oct	Jeju Air
12 Oct - 16 Oct	Jeju Air
15 Oct - 20 Oct	Jeju Air
10 Oct - 16 Oct	Jeju Air
16 Oct - 20 Oct	Jeju Air
12 Oct - 15 Oct	Jeju Air
17 Oct - 20 Oct	Jeju Air
17 Oct - 22 Oct	Jeju Air
14 Oct - 17 Oct	Jeju Air
13 Oct - 17 Oct	Jeju Air
24 Oct - 04 Nov	EVA Air
25 Oct - 04 Nov	EVA Air
29 Oct - 02 Nov	Air China
29 Oct - 07 Nov	Air China
31 Oct - 06 Nov	EVA Air

Also check the deals for one-way flights from Seoul to Singapore in October.

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 October from $365

Return flights