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

Return flights

01 Sep - 12 Sep	China Eastern
08 Sep - 25 Sep	Japan Airlines
01 Sep - 25 Sep	Japan Airlines
16 Sep - 25 Sep	Japan Airlines
04 Sep - 10 Sep	Japan Airlines
11 Sep - 17 Sep	Japan Airlines
05 Sep - 11 Sep	Japan Airlines
04 Sep - 12 Sep	Japan Airlines
05 Sep - 14 Sep	Japan Airlines
02 Sep - 10 Sep	Japan Airlines
11 Sep - 01 Oct	ANA
29 Sep - 10 Oct	ANA
15 Sep - 14 Oct	ANA
22 Sep - 14 Oct	ANA
28 Sep - 11 Oct	ANA
26 Sep - 11 Oct	ANA
25 Sep - 12 Oct	ANA
26 Sep - 05 Oct	Japan Airlines
30 Sep - 22 Oct	EVA Air
26 Sep - 12 Oct	Japan Airlines

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 $758

Return flights