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

Return flights

09 Sep - 24 Sep	WestJet
25 Sep - 23 Oct	WestJet
08 Sep - 18 Sep	WestJet
01 Sep - 11 Sep	WestJet
05 Sep - 21 Sep	WestJet
08 Sep - 22 Sep	WestJet
08 Sep - 30 Sep	WestJet
18 Sep - 29 Sep	WestJet
12 Sep - 19 Sep	WestJet
12 Sep - 30 Sep	WestJet
05 Sep - 24 Sep	WestJet
28 Sep - 20 Oct	WestJet

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 $846

Return flights