AirHint found the following cheapest return flights from Seoul (ICN) to San Francisco (SFO) in September 2026 (see full year).

Return flights

09 Sep - 18 Sep	Air Canada
13 Sep - 19 Sep	Air Canada
02 Sep - 30 Sep	China Airlines
16 Sep - 28 Sep	China Airlines
21 Sep - 28 Sep	China Airlines
19 Sep - 03 Oct	China Airlines
18 Sep - 27 Sep	Singapore Airlines
22 Sep - 27 Sep	EVA Air
22 Sep - 26 Sep	EVA Air
23 Sep - 03 Oct	EVA Air
23 Sep - 13 Oct	China Airlines
25 Sep - 02 Oct	China Airlines
24 Sep - 04 Oct	Air Canada
24 Sep - 30 Sep	Air Canada
22 Sep - 27 Sep	Korean Air	direct
24 Sep - 04 Oct	Korean Air	direct
23 Sep - 13 Oct	Korean Air	direct
21 Sep - 04 Oct	Korean Air	direct
23 Sep - 03 Oct	Asiana Airlines	direct
25 Sep - 02 Oct	Asiana Airlines	direct

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 $732

Return flights