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

Return flights

14 Oct - 19 Oct	China Eastern
15 Oct - 19 Oct	China Eastern
20 Oct - 24 Oct	Jeju Air
21 Oct - 24 Oct	Jeju Air
11 Oct - 15 Oct	Jeju Air
11 Oct - 14 Oct	Jeju Air
20 Oct - 23 Oct	Jeju Air
10 Oct - 13 Oct	Jeju Air
10 Oct - 21 Oct	Jeju Air
13 Oct - 20 Oct	Jeju Air
29 Oct - 03 Nov	Air China
30 Oct - 06 Nov	Air China
28 Oct - 10 Nov	Air China
30 Oct - 03 Nov	Air China
30 Oct - 02 Nov	Air China
29 Oct - 02 Nov	Air China
27 Oct - 03 Nov	Jeju Air
25 Oct - 01 Nov	Air China
26 Oct - 07 Nov	Jeju Air
31 Oct - 04 Nov	Jeju 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 248€

Return flights