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

Return flights

12 May - 26 May	Alaska Airlines
13 May - 26 May	Alaska Airlines
19 May - 02 Jun	Alaska Airlines
13 May - 27 May	Alaska Airlines
13 May - 24 May	Alaska Airlines
14 May - 18 May	Alaska Airlines
30 May - 07 Jun	WestJet
15 May - 31 May	Alaska Airlines
01 May - 16 May	Air Canada
20 May - 30 May	Alaska Airlines
15 May - 30 May	Alaska Airlines
01 May - 03 May	Alaska Airlines
15 May - 01 Jun	Air Canada
16 May - 01 Jun	Air Canada
22 May - 30 Jun	Air Canada
22 May - 08 Jun	Air Canada
22 May - 07 Jun	Air Canada

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 1070€

Return flights