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

Return flights

15 Oct - 26 Oct	Air Canada
31 Oct - 23 Nov	Air Canada
20 Oct - 27 Oct	Air Canada
21 Oct - 28 Oct	Air Canada
08 Oct - 29 Oct	Air Canada
22 Oct - 25 Oct	Air Canada
21 Oct - 24 Oct	Air Canada
22 Oct - 24 Oct	Air Canada
24 Oct - 27 Oct	Air Canada
08 Oct - 31 Oct	Air Canada
17 Oct - 25 Oct	Air Canada
27 Oct - 12 Nov	Air Canada
24 Oct - 01 Nov	Air Canada
29 Oct - 09 Nov	Air Canada
31 Oct - 02 Nov	Air Canada
07 Oct - 01 Nov	Air Canada
17 Oct - 01 Nov	Air Canada
20 Oct - 01 Nov	Air Canada
20 Oct - 02 Nov	Air Canada
20 Oct - 03 Nov	Air Canada

Also check the deals for one-way flights from Seoul to San Francisco 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 San Francisco in October from 263€

Return flights