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

Return flights

29 Oct - 05 Nov	Turkish Airlines
21 Oct - 05 Nov	Turkish Airlines
26 Oct - 13 Nov	Turkish Airlines
03 Oct - 26 Oct	WestJet
04 Oct - 18 Oct	Turkish Airlines
04 Oct - 19 Oct	Turkish Airlines
05 Oct - 22 Oct	Air Canada
02 Oct - 03 Nov	Air Canada
19 Oct - 13 Nov	Air Canada
30 Oct - 11 Nov	Air Canada
05 Oct - 19 Oct	Air Canada
23 Oct - 08 Nov	Air Canada
01 Oct - 04 Oct	Air Canada
24 Oct - 16 Nov	Air Canada
07 Oct - 22 Oct	Alaska Airlines
01 Oct - 31 Oct	Turkish Airlines
08 Oct - 22 Oct	Alaska Airlines
10 Oct - 10 Nov	WestJet
12 Oct - 14 Oct	Hawaiian Airlines
02 Oct - 03 Nov	Delta	direct

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 $1033

Return flights