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

Return flights

02 Oct - 12 Oct	Delta
19 Oct - 26 Oct	Frontier Airlines
02 Oct - 09 Oct	Air Canada
01 Oct - 10 Oct	Air Canada
13 Oct - 05 Nov	Air Canada
14 Oct - 05 Nov	Air Canada
13 Oct - 04 Nov	Air Canada
13 Oct - 06 Nov	Air Canada
02 Oct - 11 Oct	Air France
03 Oct - 12 Oct	United
12 Oct - 18 Oct	Delta

Also check the deals for one-way flights from Denver 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 Denver to Seoul in October from 736€

Return flights