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

Return flights

01 Oct - 08 Oct	Air Canada
20 Oct - 28 Oct	Air Canada
23 Oct - 30 Oct	Air Canada
25 Oct - 01 Nov	Alaska Airlines
02 Oct - 18 Oct	Air Canada
22 Oct - 29 Oct	Alaska Airlines
03 Oct - 11 Oct	Air Canada
25 Oct - 15 Nov	Air Canada
31 Oct - 30 Nov	Air Canada
13 Oct - 15 Oct	Alaska Airlines
18 Oct - 30 Oct	Delta
17 Oct - 30 Oct	Delta
17 Oct - 29 Oct	Delta
22 Oct - 27 Nov	Emirates
19 Oct - 13 Nov	Emirates

Also check the deals for one-way flights from Washington 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 Washington to Seoul in October from 959€

Return flights