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

Return flights

15 Sep - 21 Sep	Air Canada
20 Sep - 28 Sep	Air Canada
15 Sep - 19 Sep	Air Canada
15 Sep - 20 Sep	Air Canada
18 Sep - 20 Sep	Air Canada
22 Sep - 28 Sep	Air Canada
19 Sep - 21 Sep	Air Canada
16 Sep - 20 Sep	Air Canada
11 Sep - 19 Sep	Air Canada
08 Sep - 22 Sep	Air Canada
20 Sep - 31 Oct	Air Canada
25 Sep - 24 Oct	Air Canada
24 Sep - 29 Oct	Air Canada
22 Sep - 20 Oct	Air Premia	direct
22 Sep - 22 Oct	Air Premia	direct
15 Sep - 01 Oct	Air Premia	direct
24 Sep - 29 Oct	Air Premia	direct
24 Sep - 06 Oct	Air Canada
11 Sep - 06 Oct	Air Canada
22 Sep - 06 Oct	Air Canada

Also check the deals for one-way flights from Seoul to San Francisco in September.

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 September from 315€

Return flights