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

Return flights

24 Oct - 03 Nov	WestJet
24 Oct - 04 Nov	WestJet
23 Oct - 30 Oct	WestJet
21 Oct - 27 Nov	Frontier Airlines
21 Oct - 09 Nov	Frontier Airlines
25 Oct - 01 Nov	WestJet
31 Oct - 05 Nov	Frontier Airlines
21 Oct - 25 Oct	Frontier Airlines
25 Oct - 29 Nov	WestJet
22 Oct - 27 Oct	WestJet
29 Oct - 27 Nov	Air Canada
31 Oct - 05 Nov	Delta	direct
29 Oct - 27 Nov	Delta	direct
22 Oct - 27 Oct	Korean Air	direct
23 Oct - 30 Oct	Korean Air	direct

Also check the deals for one-way flights from Atlanta to Seoul in October.

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 October from $886

Return flights