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

Return flights

29 Sep - 10 Oct	Zipair
26 Sep - 12 Oct	China Eastern
15 Sep - 16 Oct	China Eastern
29 Sep - 06 Oct	Zipair
28 Sep - 11 Oct	Zipair
15 Sep - 30 Oct	China Eastern
29 Sep - 30 Oct	Zipair
28 Sep - 12 Oct	Zipair
28 Sep - 26 Oct	Zipair
30 Sep - 14 Oct	China Eastern
22 Sep - 29 Sep	Cathay Pacific
25 Sep - 28 Sep	Zipair
18 Sep - 25 Sep	Cathay Pacific
15 Sep - 25 Sep	Cathay Pacific
16 Sep - 23 Sep	Cathay Pacific
15 Sep - 22 Sep	Cathay Pacific
15 Sep - 21 Sep	Cathay Pacific
22 Sep - 25 Sep	Cathay Pacific
15 Sep - 29 Sep	Cathay Pacific
18 Sep - 23 Sep	Cathay Pacific

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 $664

Return flights