AirHint found the following cheapest return flights from Washington (DCA) to Seoul (ICN) in May 2026 (see full year).

Return flights

07 May - 18 May	Air Canada
15 May - 08 Jun	Air Canada
13 May - 20 May	Air Canada
06 May - 13 May	Air Canada
15 May - 30 May	Air Canada
12 May - 19 May	Air Canada
21 May - 30 May	Air Canada
26 May - 09 Jun	Air Canada
22 May - 07 Jun	Air Canada
29 May - 07 Jun	Air Canada
20 May - 30 May	Air Canada
05 May - 12 May	Cathay Pacific
29 May - 21 Jun	Air Canada
19 May - 02 Jun	Alaska Airlines
06 May - 03 Jun	Cathay Pacific
14 May - 04 Jun	Air Canada
24 May - 06 Jun	Alaska Airlines
18 May - 01 Jun	Asiana Airlines
08 May - 24 May	Cathay Pacific
17 May - 24 May	Asiana Airlines

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

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 May from $1044

Return flights