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

Return flights

20 Oct - 20 Nov	Frontier Airlines
03 Oct - 11 Oct	WestJet
02 Oct - 12 Oct	Porter Airlines (Canada) Ltd
15 Oct - 20 Nov	Frontier Airlines
13 Oct - 19 Nov	Frontier Airlines
13 Oct - 20 Nov	Frontier Airlines
27 Oct - 02 Nov	Cathay Pacific
27 Oct - 13 Nov	Turkish Airlines
20 Oct - 19 Nov	Turkish Airlines
31 Oct - 28 Nov	Air China
25 Oct - 05 Nov	Frontier Airlines
22 Oct - 29 Oct	Turkish Airlines
14 Oct - 20 Nov	Hawaiian Airlines
12 Oct - 19 Oct	Porter Airlines (Canada) Ltd
04 Oct - 24 Oct	Alaska Airlines
05 Oct - 17 Oct	Air Canada
12 Oct - 26 Oct	Hawaiian Airlines
06 Oct - 13 Oct	Air Canada
01 Oct - 15 Oct	Air Canada
01 Oct - 08 Oct	Air Canada

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 $884

Return flights