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

Return flights

23 Jun - 10 Jul	Alaska Airlines
25 Jun - 26 Jul	Alaska Airlines
17 Jun - 30 Jun	jetBlue
23 Jun - 26 Jul	Hawaiian Airlines
23 Jun - 15 Jul	Hawaiian Airlines
14 Jun - 21 Jun	Frontier Airlines
16 Jun - 10 Jul	Frontier Airlines
30 Jun - 18 Jul	Hawaiian Airlines
12 Jun - 19 Jun	Frontier Airlines
23 Jun - 01 Jul	jetBlue
21 Jun - 23 Jun	jetBlue
21 Jun - 03 Jul	Alaska Airlines
13 Jun - 20 Jun	Frontier Airlines
29 Jun - 06 Jul	Air Canada
20 Jun - 05 Jul	Alaska Airlines
10 Jun - 16 Jun	Air Canada
16 Jun - 19 Jun	jetBlue
09 Jun - 29 Jun	jetBlue
21 Jun - 28 Jun	jetBlue
13 Jun - 22 Jun	Frontier Airlines

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

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 June from $1545

Return flights