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

Return flights

03 Sep - 17 Sep	Flair Airlines
01 Sep - 10 Sep	China Eastern
01 Sep - 09 Sep	China Eastern
09 Sep - 16 Sep	China Eastern
18 Sep - 24 Oct	Flair Airlines
03 Sep - 12 Sep	Flair Airlines
18 Sep - 08 Oct	Flair Airlines
01 Sep - 09 Oct	China Eastern
01 Sep - 31 Oct	China Eastern
28 Sep - 31 Oct	Flair Airlines
22 Sep - 31 Oct	China Eastern
14 Sep - 20 Oct	Flair Airlines
03 Sep - 09 Sep	Flair Airlines
14 Sep - 18 Oct	Flair Airlines
14 Sep - 21 Sep	Flair Airlines
19 Sep - 08 Oct	Flair Airlines
04 Sep - 19 Sep	WestJet
27 Sep - 08 Oct	WestJet
04 Sep - 24 Sep	WestJet
01 Sep - 04 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 583€

Return flights