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

Return flights

09 Sep - 17 Sep	Philippine Airlines
01 Sep - 30 Sep	Philippine Airlines
21 Sep - 07 Oct	Philippine Airlines
24 Sep - 03 Oct	Philippine Airlines
04 Sep - 12 Sep	Philippine Airlines
17 Sep - 22 Sep	Philippine Airlines
09 Sep - 17 Sep	Asiana Airlines	direct
17 Sep - 22 Sep	Asiana Airlines	direct
01 Sep - 30 Sep	Asiana Airlines	direct
04 Sep - 12 Sep	Asiana Airlines	direct
24 Sep - 03 Oct	United	direct
21 Sep - 07 Oct	United	direct

Also check the deals for one-way flights from San Francisco to Seoul 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 San Francisco to Seoul in September from $629

Return flights