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

Return flights

20 Oct - 29 Oct	Japan Airlines
22 Oct - 05 Nov	ANA
13 Oct - 22 Oct	ANA
20 Oct - 27 Oct	ANA
14 Oct - 23 Oct	ANA
13 Oct - 23 Oct	ANA
14 Oct - 22 Oct	ANA
01 Oct - 29 Oct	EVA Air
24 Oct - 01 Nov	ANA
24 Oct - 08 Nov	ANA
24 Oct - 02 Nov	ANA
18 Oct - 25 Oct	ANA
19 Oct - 31 Oct	Japan Airlines
19 Oct - 27 Oct	Japan Airlines
12 Oct - 15 Nov	Japan Airlines
27 Oct - 14 Nov	ANA
19 Oct - 16 Nov	Japan Airlines
10 Oct - 13 Nov	ANA
10 Oct - 28 Nov	China Airlines

Also check the deals for one-way flights from San Francisco to Seoul 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 San Francisco to Seoul in October from $855

Return flights