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

Return flights

06 Sep - 17 Sep	WestJet
15 Sep - 29 Sep	WestJet
03 Sep - 18 Sep	WestJet
13 Sep - 21 Sep	WestJet
30 Sep - 07 Oct	WestJet
01 Sep - 29 Sep	WestJet
01 Sep - 15 Sep	WestJet
03 Sep - 15 Sep	WestJet
14 Sep - 24 Sep	WestJet
07 Sep - 14 Sep	WestJet
07 Sep - 27 Sep	WestJet
25 Sep - 05 Oct	WestJet
21 Sep - 09 Oct	Frontier Airlines
27 Sep - 10 Oct	WestJet
27 Sep - 04 Oct	United
24 Sep - 04 Oct	United
26 Sep - 03 Oct	United
09 Sep - 01 Oct	WestJet
03 Sep - 01 Oct	WestJet
13 Sep - 02 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 689€

Return flights