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

Return flights

29 Oct - 02 Nov	Jeju Air
28 Oct - 04 Nov	Jeju Air
31 Oct - 02 Nov	Air Busan
31 Oct - 06 Nov	Air Busan
31 Oct - 03 Nov	Jeju Air
31 Oct - 10 Nov	T'way Air
31 Oct - 12 Nov	T'way Air
30 Oct - 31 Oct	T'way Air
30 Oct - 12 Nov	Jeju Air
30 Oct - 13 Nov	T'way Air
26 Oct - 02 Nov	T'way Air
24 Oct - 28 Oct	T'way Air
26 Oct - 28 Oct	T'way Air
27 Oct - 29 Oct	T'way Air
25 Oct - 28 Oct	T'way Air
27 Oct - 31 Oct	T'way Air
24 Oct - 27 Oct	T'way Air
24 Oct - 25 Oct	T'way Air
24 Oct - 29 Oct	T'way Air
25 Oct - 29 Oct	T'way 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 $300

Return flights