AirHint found the following cheapest return flights from Los Angeles (LAX) to Seoul (GMP) in September 2025 (see full year).

Return flights

11 Sep - 11 Oct	Air China
12 Sep - 19 Sep	Air China
01 Sep - 11 Sep	China Eastern
08 Sep - 15 Sep	Air China
20 Sep - 27 Sep	China Eastern
15 Sep - 18 Sep	Air China
26 Sep - 11 Oct	Air China
05 Sep - 15 Sep	Air China
12 Sep - 20 Sep	Air China
08 Sep - 13 Sep	Air Canada
09 Sep - 21 Sep	Cathay Pacific
17 Sep - 22 Sep	Cathay Pacific
30 Sep - 14 Oct	Cathay Pacific
24 Sep - 01 Oct	Hawaiian Airlines
28 Sep - 05 Oct	Zipair
15 Sep - 10 Oct	EVA Air
29 Sep - 06 Oct	Air Canada
27 Sep - 13 Oct	China Southern
16 Sep - 07 Oct	Philippine Airlines
17 Sep - 16 Oct	China Eastern

Also check the deals for one-way flights from Los Angeles 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 Los Angeles to Seoul in September from 657€

Return flights