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

Return flights

01 Oct - 16 Oct	Frontier Airlines
02 Oct - 05 Oct	Frontier Airlines
15 Oct - 04 Nov	Air Canada
24 Oct - 08 Nov	Air Canada
18 Oct - 03 Nov	Air Canada
20 Oct - 13 Nov	Turkish Airlines
01 Oct - 04 Nov	Air Canada
23 Oct - 01 Nov	Hawaiian Airlines
09 Oct - 24 Oct	Frontier Airlines
01 Oct - 05 Nov	Alaska Airlines
01 Oct - 05 Oct	Frontier Airlines
10 Oct - 13 Oct	IndiGo
17 Oct - 18 Oct	Hawaiian Airlines
01 Oct - 31 Oct	Turkish Airlines
01 Oct - 29 Oct	Turkish Airlines
22 Oct - 29 Oct	Hawaiian Airlines
15 Oct - 05 Nov	Turkish Airlines
01 Oct - 04 Nov	Delta	direct
01 Oct - 05 Nov	Delta	direct
24 Oct - 26 Oct	Air France

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 843€

Return flights