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

Return flights

16 Aug - 25 Aug	Alaska Airlines
15 Aug - 25 Aug	Alaska Airlines
25 Aug - 03 Sep	Turkish Airlines
30 Aug - 23 Sep	Turkish Airlines
16 Aug - 30 Aug	Turkish Airlines
24 Aug - 30 Sep	Air Canada
26 Aug - 14 Sep	Turkish Airlines
24 Aug - 28 Sep	Air Canada
05 Aug - 02 Sep	Turkish Airlines
05 Aug - 20 Sep	Turkish Airlines
06 Aug - 20 Aug	Air Canada
06 Aug - 11 Aug	Alaska Airlines
04 Aug - 11 Aug	Alaska Airlines
07 Aug - 13 Aug	Air Canada
06 Aug - 18 Aug	Alaska Airlines
14 Aug - 28 Aug	Hawaiian Airlines
05 Aug - 04 Sep	Turkish Airlines
20 Aug - 27 Aug	Turkish Airlines
25 Aug - 03 Sep	Delta	direct
05 Aug - 20 Sep	Delta	direct

Also check the deals for one-way flights from Washington to Seoul in August.

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 August from $968

Return flights