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

Return flights

27 Sep - 13 Oct	Frontier Airlines
15 Sep - 20 Oct	WestJet
09 Sep - 23 Sep	WestJet
28 Sep - 26 Oct	WestJet
03 Sep - 09 Sep	WestJet
12 Sep - 10 Oct	WestJet
21 Sep - 09 Oct	WestJet
16 Sep - 23 Sep	WestJet
08 Sep - 27 Sep	WestJet
01 Sep - 29 Sep	WestJet
09 Sep - 01 Oct	WestJet
01 Sep - 06 Oct	WestJet
01 Sep - 27 Sep	WestJet
28 Sep - 05 Oct	WestJet
03 Sep - 01 Oct	WestJet
17 Sep - 16 Oct	WestJet
04 Sep - 15 Sep	Cathay Pacific
01 Sep - 14 Sep	Alaska Airlines
03 Sep - 05 Sep	Hawaiian Airlines
09 Sep - 12 Sep	Alaska Airlines

Also check the deals for one-way flights from Atlanta 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 Atlanta to Seoul in September from $786

Return flights